73 6. Pr operty , Plant and Equipment Property , plant and equipment consisted of the following (in millions):   Dec 31, 2012 Dec 31, 2011 Land $ 128.0 $ 110.5 Buildings and leasehold improvements 375.3 302.2 Machinery, equipment and office furnishings 1,257.6 1,051.6 Construction in progress 78.6 95.3 Total — gross book value 1,839.5 1,559.6 Less accumulated depreciation (639.7 ) (535.8 ) Total — net book value $ 1,199.8 $ 1,023.8 Depreciation expense totaled $ 102.2 million , $97.4 million and $84.8 million for the years ended December 31, 2012 , 201 1 and 2010 , respectively . Capital leases included within property , plant and equipment on the balance sheet were $ 10.9 million at December 31, 2012 and $ 7.8 million at December 31, 201 1 . Accumulated depreciation on capital leases was $ 3.7 million at December 31, 2012 and $ 2.6 million at December 31, 201 1 . 7. Goodwill and Other Intangible Assets, net The amounts of goodwill and indefinite-lived intangible assets were as follows in millions of dollars: Goodwill Indefinite-lived assets — Trade names North America Europe and Mediterranean ROW Total North America Europe and Mediterranean ROW Total Balance, December 31, 2010 $ 2.3 $ 6.8 $ 169.4 $ 178.5 $ 2.4 $ 0.5 $ 136.0 $ 138.9 Acquisitions — — — — — — — — Currency translation and other adjustments — (4.5 ) (5.9 ) (10.4 ) — — (3.7 ) (3.7 ) Balance, December 31, 2011 $ 2.3 $ 2.3 $ 163.5 $ 168.1 $ 2.4 $ 0.5 $ 132.3 $ 135.2 Acquisitions 11.6 — 3.7 15.3 — — — — Currency translation and other adjustments (0.3 ) (0.1 ) 1.4 1.0 — — 0.8 0.8 Balance, December 31, 2012 $ 13.6 $ 2.2 $ 168.6 $ 184.4 $ 2.4 $ 0.5 $ 133.1 $ 136.0 Acquisitions in the North America segment during 2012 include goodwill of $ 3.5 million related to the acquisition of Alcan Cable North America, $ 7.8 million related to the acquisition of Prestolite and $ 0.3 million related to immaterial acquisitions. The Procables acquisition resulted in $ 3.7 million of goodwill in the ROW segment in 2012 . The amounts of other intangible assets were as follows in millions of dollars:   Dec 31, 2012 Dec 31, 2011 Amortized intangible assets:     Amortized intangible assets $ 140.1 $ 108.3 Accumulated amortization (73.3 ) (61.8 ) Foreign currency translation adjustment 0.3 (0.1 ) Total Amortized intangible assets $ 67.1 $ 46.4 Amortized intangible assets are stated at cost less accumulated amortization as of December 31, 2012 and 201 1 . As part of the acquisitions of Alcan Cable North America and Prestolite, the Company acquired certain customer relationships for which the fair market value as of September 4, 2012 and November 2, 2012 were $ 5.9 million and $ 1 1.7 million , respectively . Other immaterial acquisitions include intangible assets from certain customer relationships of $ 3.4 million . Customer relationships have been determined to have a useful life in the range of 7 to 12  years, and the Company has accelerated the amortization expense to align with the historical customer attrition rates. The approximate weighted average useful life of the amortized intangible assets is 10 T able of Contents