Components Of Income Tax Expense (Benefit) From Operations (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Components Of Income Tax Expense Benefit [Line Items]
Federal, Current	$ 8.6	$ (10.1)	$ 100.1
Federal, Deferred	(55.5)	(82.1)	(1.7)
State, Current	10.5	(19.5)	(1.2)
State, Deferred	(18.3)	(21.5)	(10.3)
Foreign, Current	46.5	36.3	41.6
Foreign, Deferred	21.8	(19.4)	(22.6)
Total	$ 13.6	$ (116.3)	$ 105.9