Commitments and Contingencies - Changes in Accrued Environmental Remediation and Related Costs (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Commitments And Contingent Liabilities [Line Items]
Balance at the beginning of the year	$ 50.2	$ 43.2	$ 42.3
Additions charged to expense, net	69.0	15.0	11.3
Acquired	7.0
Payments, net	(3.4)	(8.1)	(10.4)
Changes in currency exchange rates	(0.1)	0.1
Balance at the end of the year	122.7	50.2	43.2
Amounts recognized in our Consolidated Balance Sheet at the end of the year:
Current liabilities	9.1	7.6	8.6
Noncurrent liabilities	113.6	42.6	34.6
Total	$ 122.7	$ 50.2	$ 43.2