Cumulative Amount of Unrecognized Hedge Losses Recorded in Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Derivative Instruments Gain Loss [Line Items]
Cumulative amount of unrecognized hedge losses recorded in AOCI	$ 37.9	$ 20.9
Net Investment Hedging [Member]
Derivative Instruments Gain Loss [Line Items]
Cumulative amount of unrecognized hedge losses recorded in AOCI	39.0	20.9
Net Investment Hedging [Member] | Foreign Exchange Contract [Member]
Derivative Instruments Gain Loss [Line Items]
Cumulative amount of unrecognized hedge losses recorded in AOCI	34.3	$ 20.9
Net Investment Hedging [Member] | Long-Term Debt [Member]
Derivative Instruments Gain Loss [Line Items]
Cumulative amount of unrecognized hedge losses recorded in AOCI	4.7
Cash Flow Hedging [Member] | Treasury Rate Lock [Member]
Derivative Instruments Gain Loss [Line Items]
Cumulative amount of unrecognized hedge losses recorded in AOCI	$ (1.1)