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	Dec. 31, 2013	Dec. 31, 2012
Other current assets [Member]
Derivatives And Hedging Activities [Line Items]
Gross Amount	$ 60.2	$ 30.3
Offset	13.5	15.2
Net Amount in Balance Sheet	46.7	15.1
Other assets [Member]
Derivatives And Hedging Activities [Line Items]
Gross Amount	30.2	19.8
Offset	8.2	6.5
Net Amount in Balance Sheet	22.0	13.3
Other current liabilities [Member]
Derivatives And Hedging Activities [Line Items]
Gross Amount	26.4	20.2
Offset	13.5	15.2
Net Amount in Balance Sheet	12.9	5.0
Other long-term liabilities [Member]
Derivatives And Hedging Activities [Line Items]
Gross Amount	15.9	12.3
Offset	8.2	6.5
Net Amount in Balance Sheet	$ 7.7	$ 5.8