Derivatives - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended						3 Months Ended		3 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Fair Value Hedging	Dec. 31, 2012 Fair Value Hedging	Dec. 31, 2011 Fair Value Hedging	Mar. 31, 2012 Senior Notes Eight Point Two Five Percent Due March Fifteen Two Thousand Nineteen	Mar. 13, 2012 Senior Notes Eight Point Two Five Percent Due March Fifteen Two Thousand Nineteen	Mar. 31, 2012 Senior Notes Four Point Nine Five Percent Due April One Two Thousand Fourteen	Apr. 09, 2010 Senior Notes Four Point Nine Five Percent Due April One Two Thousand Fourteen	Dec. 31, 2013 Not Designated as Hedging Instrument Foreign Exchange Contract	Dec. 31, 2012 Not Designated as Hedging Instrument Foreign Exchange Contract	Mar. 31, 2012 Designated as Hedging Instrument Interest Rate Swap	Apr. 09, 2010 Designated as Hedging Instrument Interest Rate Swap
Derivative [Line Items]
Aggregate notional value											$ 372.1	$ 654.2	$ 400.0	$ 600.0
Derivative, inception date							Mar. 13, 2012		Apr. 09, 2010
Debt instrument, face amount							450.0	450.0
Interest rate							8.25%	8.25%	4.95%	4.95%
Maturity date							Mar. 15, 2019		Apr. 01, 2014
Repayment of Debt									341.8
Terminated portion of interest rate swap agreement, notional amount									342.0
Proceeds from termination of interest rate swaps	11.0
Reduction to interest expense	$ 261.4	$ 251.8	$ 243.3	$ 8.7	$ 8.0	$ 9.9