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	Mar. 31, 2016	Dec. 31, 2015
Other Current Assets [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gross Amount	$ 56.1	$ 100.5
Offset	23.6	16.3
Net Amount in Balance Sheet	32.5	84.2
Other Assets [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gross Amount	5.6	19.8
Offset	5.2	7.1
Net Amount in Balance Sheet	0.4	12.7
Other Current Liabilities [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gross Amount	29.6	16.7
Offset	23.6	16.3
Net Amount in Balance Sheet	6.0	0.4
Other Long-term Liabilities [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gross Amount	20.7	8.3
Offset	5.2	7.1
Net Amount in Balance Sheet	$ 15.5	$ 1.2