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, 2017	Dec. 31, 2016
Other Current Assets [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gross Amount	$ 19.9	$ 57.9
Offset	16.5	20.6
Net Amount in Balance Sheet	3.4	37.3
Other Assets [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gross Amount	10.0	34.9
Offset	7.3	6.8
Net Amount in Balance Sheet	2.7	28.1
Other Current Liabilities [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gross Amount	22.6	20.9
Offset	16.5	20.6
Net Amount in Balance Sheet	6.1	0.3
Other Long-term Liabilities [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gross Amount	14.9	6.9
Offset	7.3	6.8
Net Amount in Balance Sheet	$ 7.6	$ 0.1