Components of Income Tax Expense (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Current:
Federal	$ 22.3	$ 1.8	$ 0.5
State	3.0	2.3	0.8
Foreign	24.6	28.5	23.0
Current Income Tax Expense (Benefit), Total	49.9	32.6	24.3
Deferred:
Federal	41.6	52.4	39.2
State	2.2	3.9	4.8
Foreign	6.1	6.3	(0.2)
Total Deferred Income Tax Expense (Benefit), Total	49.9	62.6	43.8
Total income tax expense	$ 99.8	$ 95.2	$ 68.1