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Derivatives - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Sep. 30, 2012
Fair Value Hedging [Member]
Sep. 30, 2011
Fair Value Hedging [Member]
Sep. 30, 2012
Fair Value Hedging [Member]
Sep. 30, 2011
Fair Value Hedging [Member]
Sep. 30, 2012
8.25% Senior Notes Due March 15, 2019 [Member]
Mar. 13, 2012
8.25% Senior Notes Due March 15, 2019 [Member]
Sep. 30, 2012
4.95% Senior Notes Due April 1, 2014 [Member]
Derivative [Line Items]                        
Aggregate notional value of foreign exchange forward contracts $ 614.7   $ 614.7   $ 78.3              
Derivative, inception date                   Mar. 13, 2012   Apr. 09, 2010
Notional amount of interest rate fair value hedge derivatives                   400.0   600.0
Debt instrument, face amount                   450.0 450.0  
Interest rate                   8.25% 8.25% 4.95%
Maturity date                   Mar. 15, 2019   Apr. 01, 2014
Terminated portion of interest rate swap agreement, notional amount                       342.0
Repurchase of debt                       341.8
Proceeds from termination of interest rate swaps     11.0                  
Reduction to interest expense $ 63.7 $ 62.9 $ 188.0 $ 182.1   $ 1.9 $ 2.5 $ 5.9 $ 7.6