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	Jun. 30, 2016	Dec. 31, 2015
Other Current Assets [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gross Amount	$ 45.8	$ 100.5
Offset	26.3	16.3
Net Amount in Balance Sheet	19.5	84.2
Other Assets [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gross Amount	10.9	19.8
Offset	7.1	7.1
Net Amount in Balance Sheet	3.8	12.7
Other Current Liabilities [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gross Amount	44.5	16.7
Offset	26.3	16.3
Net Amount in Balance Sheet	18.2	0.4
Other Long-term Liabilities [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gross Amount	23.6	8.3
Offset	7.1	7.1
Net Amount in Balance Sheet	$ 16.5	$ 1.2