Summary of Notional Amounts of Outstanding Foreign Exchange Forwards, Cash Flow Hedging (Detail) In Millions, unless otherwise specified	Dec. 31, 2013 Foreign Currency Forward Contracts To Purchase U S Dollars With Euros USD ($)	Dec. 31, 2012 Foreign Currency Forward Contracts To Purchase U S Dollars With Euros USD ($)	Dec. 31, 2013 Foreign Currency Forward Contracts To Sell U S Dollars For Euros USD ($)	Dec. 31, 2012 Foreign Currency Forward Contracts To Sell U S Dollars For Euros USD ($)	Dec. 31, 2013 Foreign Currency Forward Contracts To Purchase U S Dollars With GBP USD ($)	Dec. 31, 2012 Foreign Currency Forward Contracts To Purchase U S Dollars With GBP USD ($)	Dec. 31, 2013 Foreign Currency Forward Contracts To Sell U S Dollars For GBP USD ($)	Dec. 31, 2012 Foreign Currency Forward Contracts To Sell U S Dollars For GBP USD ($)	Dec. 31, 2013 Foreign Currency Forward Contracts To Purchase U S Dollars With Other Foreign Currencies USD ($)	Dec. 31, 2012 Foreign Currency Forward Contracts To Purchase U S Dollars With Other Foreign Currencies USD ($)	Dec. 31, 2013 Foreign Currency Forward Contracts To Sell U S Dollars For Other Foreign Currencies USD ($)	Dec. 31, 2012 Foreign Currency Forward Contracts To Sell U S Dollars For Other Foreign Currencies USD ($)	Dec. 31, 2013 Foreign Currency Forward Contracts To Purchase Euros With Other Foreign Currencies EUR (€)	Dec. 31, 2012 Foreign Currency Forward Contracts To Purchase Euros With Other Foreign Currencies EUR (€)	Dec. 31, 2013 Foreign Currency Forward Contracts To Purchase Euros With GBP EUR (€)	Dec. 31, 2012 Foreign Currency Forward Contracts To Purchase Euros With GBP EUR (€)	Dec. 31, 2013 Foreign Currency Forward Contracts To Sell Euros For GBP EUR (€)	Dec. 31, 2012 Foreign Currency Forward Contracts To Sell Euros For GBP EUR (€)
Derivative [Line Items]
Contracts to purchase foreign currencies	$ 14.2	$ 34.3			$ 0	$ 2.1			$ 0	$ 6.7			€ 13.1	€ 14.4	€ 22.1	€ 0
Contracts to sell foreign currencies			$ 53.2	$ 48.4			$ 0	$ 1.7			$ 0	$ 5.1					€ 0	€ 8.9