Summary of Notional Amounts and Fair Value of the Company's Cash Flow Hedges (Parenthetical) (Detail) (Foreign Exchange Contract, Cash Flow Hedging) In Millions, unless otherwise specified	Dec. 31, 2011 AUD	Dec. 31, 2011 CAD	Dec. 31, 2011 CHF	Dec. 31, 2011 DKK	Dec. 31, 2011 EUR (€)	Dec. 31, 2011 GBP (£)	Dec. 31, 2011 JPY (¥)	Dec. 31, 2011 KRW	Dec. 31, 2011 MXN	Dec. 31, 2011 NOK	Dec. 31, 2011 PLN	Dec. 31, 2011 SEK	Dec. 31, 2011 SGD	Dec. 31, 2011 TWD
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Forward sale	13.2	35.0	25.3		€ 97.5		¥ 500.0	5,700.0	159.3		5.4		2.5	47.0
Forward purchase				14.9		£ 6.9				11.8		1,200.0