Cumulative Amount of Unrecognized Hedge Losses Recorded in Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Derivative [Line Items]
Cumulative amount of unrecognized hedge losses recorded in AOCI	$ 20.0	$ 37.9
Net Investment Hedging [Member]
Derivative [Line Items]
Cumulative amount of unrecognized hedge losses recorded in AOCI	21.3	39.0
Net Investment Hedging [Member] | Foreign Exchange Contract [Member]
Derivative [Line Items]
Cumulative amount of unrecognized hedge losses recorded in AOCI	29.7	34.3
Net Investment Hedging [Member] | Long-Term Debt [Member]
Derivative [Line Items]
Cumulative amount of unrecognized hedge losses recorded in AOCI	(8.4)	4.7
Cash Flow Hedging [Member]
Derivative [Line Items]
Cumulative amount of unrecognized hedge losses recorded in AOCI	(1.3)	(1.1)
Cash Flow Hedging [Member] | Interest Rate Cap [Member]
Derivative [Line Items]
Cumulative amount of unrecognized hedge losses recorded in AOCI	(1.1)	$ (1.1)
Cash Flow Hedging [Member] | Cross-Currency Swap [Member]
Derivative [Line Items]
Cumulative amount of unrecognized hedge losses recorded in AOCI	$ (0.2)