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Net Deferred Tax Liabilities (Detail) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Schedule of Deferred Income Tax Assets and Liabilities    
Property and equipment $ 1,211.5 $ 1,459.8
Unrealized foreign exchange gains 0.0 630.9
Intangible liabilities 296.2 445.2
Other 242.0 287.6
Deferred Tax Liabilities, Gross 1,749.7 2,823.5
Property and equipment (633.8) (650.2)
Employee benefit plans (253.1) (395.0)
Intangible assets (228.8) (170.7)
Deferred foreign tax credits (208.6) (316.8)
Operating loss carryforwards (71.1) (292.7)
Other (266.0) (338.6)
Total deferred tax assets before valuation allowance (1,661.4) (2,164.0)
Valuation allowance 163.2 168.0
Deferred Tax Liabilities, Net 251.5 827.5
Balance sheet presentation: [Abstract]    
Deferred income taxes 1,119.4 1,817.1
Disposal Group, Held-for-sale, Not Discontinued Operations [Member]    
Balance sheet presentation: [Abstract]    
Deferred tax assets 0.0 (185.6)
Other assets-miscellaneous    
Balance sheet presentation: [Abstract]    
Deferred tax assets $ (867.9) $ (804.0)