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, 2016	Dec. 31, 2015
Other Current Assets [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gross Amount	$ 31.4	$ 100.5
Offset	22.3	16.3
Net Amount in Balance Sheet	9.1	84.2
Other Assets [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gross Amount	8.5	19.8
Offset	6.5	7.1
Net Amount in Balance Sheet	2.0	12.7
Other Current Liabilities [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gross Amount	50.1	16.7
Offset	22.3	16.3
Net Amount in Balance Sheet	27.8	0.4
Other Long-term Liabilities [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gross Amount	22.1	8.3
Offset	6.5	7.1
Net Amount in Balance Sheet	$ 15.6	$ 1.2