Income Taxes - Components of Comprehensive Provision for Income Taxes Allocation (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Schedule Of Income Tax [Line Items]
United States	$ (35.3)	$ 40.1	$ (70.4)
Non-U.S. subsidiaries	(38.5)	71.9	(147.5)
Income (loss) before income taxes	(73.8)	112.0	(217.9)
Expected tax expense (benefit) at U.S. federal statutory income tax rate of 35%	(25.8)	39.2	(76.3)
Non-U.S. tax rates	0.6	(4.1)	4.3
Incremental net benefit on earnings (losses) of non-U.S. and U.S. subsidiaries	(37.6)	(2.2)	(18.5)
Valuation allowance	159.0
U.S. state income taxes, net	(1.3)	4.1	(3.4)
Adjustment to the reserve for uncertain tax positions, net	0.8	(3.7)	2.1
Nondeductible expenses	3.0	2.8	2.9
Tax rate changes			(0.2)
Other, net	(1.4)	(3.6)	(1.9)
Provision for income taxes (benefit)	97.3	32.5	(91.0)
Comprehensive provision for income taxes (benefit) allocable to:
Net income (loss)	97.3	32.5	(91.0)
Other comprehensive income (loss):
Marketable securities	(4.1)	(11.3)	5.1
Currency translation	(17.3)	(16.9)	5.5
Interest rate swap	(1.7)
Total	77.9	(30.1)	(65.3)
Defined Benefit Pension Plans
Other comprehensive income (loss):
Defined benefit plans	4.1	(33.2)	14.1
OPEB
Other comprehensive income (loss):
Defined benefit plans	$ (0.4)	$ (1.2)	$ 1.0