Derivative Instruments and Hedging Activities - Schedule of Effects of Master Netting Agreements on Consolidated Balance Sheets (Detail) - Cash Flow Hedges [Member] - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Other Current Assets [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gross Amount	$ 57.9	$ 100.5
Offset	20.6	16.3
Net Amount in Balance Sheet	37.3	84.2
Other Assets [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gross Amount	34.9	19.8
Offset	6.8	7.1
Net Amount in Balance Sheet	28.1	12.7
Other Current Liabilities [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gross Amount	20.9	16.7
Offset	20.6	16.3
Net Amount in Balance Sheet	0.3	0.4
Other Long-term Liabilities [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gross Amount	6.9	8.3
Offset	6.8	7.1
Net Amount in Balance Sheet	$ 0.1	$ 1.2