Income Taxes - Provision for Income Taxes (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current
Federal income tax	$ 0.7	$ 3.2	$ 2.2
State and local income tax	4.9	8.2	5.2
Foreign income tax	27.4	54.1	44.0
Subtotal	33.0	65.5	51.4
Deferred
Federal income tax	(36.7)	(5.2)	(1.5)
State and local income tax	(2.6)	2.9	8.7
Foreign income tax	8.4	13.6	37.6
Subtotal	(30.9)	11.3	44.8
Total provision for income taxes	$ 2.1	$ 76.8	$ 96.2