Income Taxes - Components of Income Tax (Benefit) Provision (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Current tax expense:
Federal	$ (6.8)	$ 37.0	$ 22.1
State and local	(6.2)	5.9	5.6
Foreign	69.5	77.5	63.1
Total current	56.5	120.4	90.8
Deferred tax (benefit) expense:
Federal	(231.2)	(54.4)	2.1
State and local	(24.8)	(5.3)	(2.1)
Foreign	(62.4)	(1.2)	(3.3)
Total deferred tax benefit	(318.4)	(60.9)	(3.3)
Total (benefit) provision	$ (261.9)	$ 59.5	$ 87.5