Cumulative Amount of Unrecognized Hedge Losses Recorded in Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Derivative [Line Items]
Cumulative amount of unrecognized hedge losses recorded in AOCI	$ 17.3	$ 37.9
Net Investment Hedging [Member]
Derivative [Line Items]
Cumulative amount of unrecognized hedge losses recorded in AOCI	19.8	39.0
Net Investment Hedging [Member] | Foreign exchange forward [Member]
Derivative [Line Items]
Cumulative amount of unrecognized hedge losses recorded in AOCI	21.1	34.3
Net Investment Hedging [Member] | Long Term Debt [Member]
Derivative [Line Items]
Cumulative amount of unrecognized hedge losses recorded in AOCI	(1.3)	4.7
Cash Flow Hedging [Member]
Derivative [Line Items]
Cumulative amount of unrecognized hedge losses recorded in AOCI	(2.5)	(1.1)
Cash Flow Hedging [Member] | Treasury Rate Lock [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	$ (1.4)