Income Taxes - Component of Income Taxes Expenses (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Currently payable (refundable):
U.S. federal and state	$ 0.9	$ 8.0	$ 3.6
Non-U.S.	42.6	78.7	16.2
Total	43.5	86.7	19.8
Deferred income taxes:
U.S. federal and state	34.5	28.6	19.0
Non-U.S.	26.8	54.6	(24.3)
Total	51.5	95.3	(11.1)
Provision for income taxes	$ 104.8	$ 169.9	$ 14.5