Summary of Components of Interest as Presented in Consolidated Statements of Operations (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Income	$ 9.7	$ 6.7	$ 5.5
Expense on borrowings	(120.6)	(118.4)	(92.3)
Expense on UTPs and other tax related liabilities	(5.3)	(5.8)	(8.6)
Legacy Tax	0.7	0.7	3.6
Capitalized	0.4
Total	(115.1)	(116.8)	(91.8)
Interest paid	$ 108.3	$ 113.7	$ 81.9