Other Assets - Components of Other Assets (Parenthetical) (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Mar. 31, 2015
Other Assets [Line Items]
Amortization expense	$ 22.6	$ 25.2	$ 71.2	$ 79.1
Puerto Rico Tax Restructuring [Member]
Other Assets [Line Items]
Prepay of taxes					$ 20.2