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Income Taxes - Components of Effective Income Tax Rate Reconciliation and Comprehensive Provision for Income Taxes Allocation (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Schedule Of Income Tax [Line Items]        
Expected tax expense (benefit), at U.S. federal statutory income tax rate of 35% $ 8.1 $ (6.8) $ 8.2 $ (2.2)
Non-U.S. tax rates (1.0) (0.1) (1.4) (0.7)
Incremental net tax expense (benefit) on earnings and losses of non-U.S. companies (0.8) (4.2) (1.6) (3.1)
Valuation allowance (0.8) 2.3 2.1 152.6
Adjustment to the reserve for uncertain tax positions, net 0.4 0.3 0.6 0.1
Nondeductible expenses 0.3 0.9 0.7 0.4
U.S. state income tax and other, net 0.1 0.2 0.2  
Provision (benefit) for income taxes 0.7 (7.4) 3.2 147.1
Comprehensive provision for income taxes allocable to net income (loss) 0.7 (7.4) 3.2 147.1
Other comprehensive income (loss):        
Marketable securities 0.5 2.0 0.6 1.5
Interest rate swap 0.4 (2.0) (1.6) (2.0)
Total 1.7 (7.3) 2.5 147.0
US-Canada APA        
Schedule Of Income Tax [Line Items]        
U.S.-Canada APA (5.6)   (5.6)  
Defined Benefit Pension Plans        
Other comprehensive income (loss):        
Benefit plans $ 0.1 $ 0.1 0.4 0.5
OPEB        
Other comprehensive income (loss):        
Benefit plans     $ (0.1) $ (0.1)