Derivative Financial Instruments - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash Flow Hedging
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Maximum length of future cash flow hedges	5 years 5 months 8 days
Recognized gain on the ineffective portion of cash flow hedges	$ 0.0	$ 0.0	$ 0.1
Accumulated net loss on derivative contracts included in accumulated other comprehensive loss expected to be recognized in the Consolidated Statements of Comprehensive Income in the following 12 months, net of tax	(6.0)
Gains or losses reclassified out of AOCI into net income based on the probability that the original forecasted transaction would not occur	0.0	$ 0.0	$ 0.0
Interest-Rate Contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount of outstanding contracts	3,303.5
Notional maturities for interest-rate contracts 2016	1,276.4
Notional maturities for interest-rate contracts 2017	728.0
Notional maturities for interest-rate contracts 2018	1,040.5
Notional maturities for interest-rate contracts 2019	95.0
Notional maturities for interest-rate contracts 2020	141.3
Notional maturities for interest-rate contracts thereafter	22.3
Foreign-exchange contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative notional amount outstanding	$ 286.1
Foreign-exchange contracts maturity period	Within one year