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	Sep. 30, 2015	Dec. 31, 2014
Other Current Assets [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gross Amount	$ 109.6	$ 98.7
Offset	14.8	15.9
Net Amount in Balance Sheet	94.8	82.8
Other Assets [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gross Amount	29.3	53.1
Offset	9.4	10.4
Net Amount in Balance Sheet	19.9	42.7
Other Current Liabilities [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gross Amount	15.6	16.4
Offset	14.8	15.9
Net Amount in Balance Sheet	0.8	0.5
Other Long-term Liabilities [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gross Amount	10.4	11.6
Offset	9.4	10.4
Net Amount in Balance Sheet	$ 1.0	$ 1.2