Commitments and Contingencies - Changes in Accrued Environmental Remediation and Related Costs (Detail) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2015	Dec. 31, 2014
Environmental Remediation Obligations [Abstract]
Balance at the beginning of the year	$ 118.5
Additions charged to expense, net	2.6
Payments, net	(1.3)
Currency and other	0.9
Balance at the end of period	120.7
Amounts recognized in our Condensed Consolidated Balance Sheet at the end of the period:
Current liabilities		$ 9.9	$ 10.2
Noncurrent liabilities		110.8	108.3
Total	$ 118.5	$ 120.7	$ 118.5