Cumulative Amount of Unrecognized Hedge Losses Recorded in Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Derivative [Line Items]
Cumulative amount of unrecognized hedge losses recorded in AOCI	$ 16.2	$ 37.9
Net Investment Hedging [Member]
Derivative [Line Items]
Cumulative amount of unrecognized hedge losses recorded in AOCI	16.4	39.0
Net Investment Hedging [Member] | Foreign exchange forward [Member]
Derivative [Line Items]
Cumulative amount of unrecognized hedge losses recorded in AOCI	20.9	34.3
Net Investment Hedging [Member] | Long Term Debt [Member]
Derivative [Line Items]
Cumulative amount of unrecognized hedge losses recorded in AOCI	(4.5)	4.7
Cash Flow Hedging [Member]
Derivative [Line Items]
Cumulative amount of unrecognized hedge losses recorded in AOCI	(0.2)	(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	$ 0.9