Income Taxes - Components of Income Taxes and 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]
U.S.	$ 5.5	$ 59.2	$ (15.1)
Non-U.S.	(36.3)	74.5	(144.8)
Income (loss) before income taxes	(30.8)	133.7	(159.9)
Expected tax expense (benefit), at U.S. federal statutory income tax rate of 35%	(10.8)	46.8	(56.0)
Non-U.S. tax rates	0.5	(4.2)	4.2
Incremental net tax (benefit) on earnings and losses of non-U.S. companies	(8.7)	(3.7)	(7.4)
Valuation allowance	159.0
Adjustment to the reserve for uncertain tax positions, net	0.7	(5.1)	(0.4)
Nondeductible expenses	2.1	1.9	2.1
U.S. state income taxes and other, net		(1.2)	(0.4)
Provision for income taxes (benefit)	142.8	34.5	(57.9)
Currently payable (refundable):
U.S. federal and state	0.3	1.9	7.3
Non-U.S.	3.3	15.2	(1.2)
Total	3.6	17.1	6.1
Deferred income taxes (benefit):
U.S. federal and state	(6.4)	10.0	(22.0)
Non-U.S.	145.6	7.4	(42.0)
Total	139.2	17.4	(64.0)
Comprehensive provision for income taxes (benefit) allocable to net income (loss)	142.8	34.5	(57.9)
Other comprehensive income (loss):
Currency translation		(16.9)	5.5
Marketable securities	1.1	(6.7)	3.1
Interest rate swap	(1.3)
Total	144.0	(19.6)	(36.1)
Defined Benefit Pension Plans
Other comprehensive income (loss):
Benefit plans	1.5	(30.1)	11.8
OPEB
Other comprehensive income (loss):
Benefit plans	$ (0.1)	$ (0.4)	$ 1.4