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Income Taxes - Components of Income Taxes and Comprehensive Provision for Income Taxes Allocation (Detail) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Schedule Of Income Tax [Line Items]            
U.S.       $ 38.6 $ 11.5 $ 5.5
Non-U.S.       267.1 49.7 (36.3)
Income (loss) before income taxes       305.7 61.2 (30.8)
Expected tax expense (benefit), at U.S. federal statutory income tax rate of 35%       107.0 21.4 (10.8)
Non-U.S. tax rates       (13.2) (4.3) 0.5
Incremental net tax expense (benefit) on earnings and losses of U.S. and non-U.S. companies       (8.4) 2.2 (8.7)
Valuation allowance       (205.4) (2.2) 159.0
Transition Tax $ 76.2     76.2    
Tax rate changes       (0.2) (0.1)  
Adjustment to the reserve for uncertain tax positions, net   $ 2.4   (8.6) 2.4 0.7
Nondeductible expenses       1.7 1.5 2.1
U.S. state income taxes and other, net       2.1 0.4  
Income tax expense (benefit)       (48.8) 17.9 142.8
Current payable:            
U.S. federal and state       3.0   0.3
Non-U.S.       37.5 9.5 3.3
Total       40.5 9.5 3.6
Deferred income taxes (benefit):            
U.S. federal and state       (13.7) 4.3 (6.4)
Non-U.S.       (145.7) 4.1 145.6
Total       (159.4) 8.4 139.2
Comprehensive provision for income taxes (benefit) allocable to:            
Net income       (48.8) 17.9 142.8
Other comprehensive income (loss):            
Currency translation       19.8    
Marketable securities       1.6 1.3 1.1
Interest rate swap       1.1 0.2 (1.3)
Total       (20.9) 18.4 144.0
Defined Benefit Pension Plans            
Other comprehensive income (loss):            
Benefit plans       5.6 (0.8) 1.5
OPEB            
Other comprehensive income (loss):            
Benefit plans       (0.2) (0.2) $ (0.1)
Noncurrent payable - U.S. federal            
Schedule Of Income Tax [Line Items]            
Transition Tax       $ 70.1    
U.S. - Canada APA            
Schedule Of Income Tax [Line Items]            
U.S. - Canada APA   $ 2.2 $ (5.6)   $ (3.4)