Derivative Instruments and Hedging Activities - Schedule of Effects of Master Netting Agreements on Condensed Consolidated Balance Sheets (Detail) (Cash flow hedges [Member], USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Other current assets [Member]
Derivatives And Hedging Activities [Line Items]
Gross Amount	$ 50.9	$ 60.2
Offset	13.6	13.5
Net Amount in Balance Sheet	37.3	46.7
Other assets [Member]
Derivatives And Hedging Activities [Line Items]
Gross Amount	18.8	30.2
Offset	6.9	8.2
Net Amount in Balance Sheet	11.9	22.0
Other current liabilities [Member]
Derivatives And Hedging Activities [Line Items]
Gross Amount	25.4	26.4
Offset	13.6	13.5
Net Amount in Balance Sheet	11.8	12.9
Other long-term liabilities [Member]
Derivatives And Hedging Activities [Line Items]
Gross Amount	13.4	15.9
Offset	6.9	8.2
Net Amount in Balance Sheet	$ 6.5	$ 7.7