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, 2020	Dec. 31, 2019
Other Current Assets [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gross Amount	$ 18.1	$ 41.8
Offset	7.1	7.9
Net Amount in Balance Sheet	11.0	33.9
Other Assets [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gross Amount	5.5	9.8
Offset	4.7	4.6
Net Amount in Balance Sheet	0.8	5.2
Other Current Liabilities [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gross Amount	8.3	7.9
Offset	7.1	7.9
Net Amount in Balance Sheet	1.2
Other Long-term Liabilities [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gross Amount	9.1	5.2
Offset	4.7	4.6
Net Amount in Balance Sheet	$ 4.4	$ 0.6