Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013 Interest Rate Swaps	Jun. 30, 2013 Not Designated as Hedging Instrument Foreign Exchange Swaps	Jun. 30, 2012 Not Designated as Hedging Instrument Foreign Exchange Swaps	Jun. 30, 2013 Less Than Six Months Fair Value, Measurements, Recurring Not Designated as Hedging Instrument Foreign Exchange Swaps Other Current Assets Liabilities	Dec. 31, 2012 Less Than Six Months Fair Value, Measurements, Recurring Not Designated as Hedging Instrument Foreign Exchange Swaps Other Current Assets Liabilities
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative notional volume, amount after offsetting swaps		$ 472.4	$ 675.7	$ 472.4	$ 569.9
Derivative asset, amount after offsetting swaps				0.4	0.6
Derivative liability, amount after offsetting swaps				0.4	0.6
Interest rate derivative asset	$ 60