Derivative Instruments and Hedging Activities - Schedule of Effects of Master Netting Agreements on Consolidated Balance Sheets (Detail) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Derivatives Not Designated as Hedges [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gross Amount	$ 1.5
Gross Amount	3.8
Other Current Assets [Member] | Derivatives Not Designated as Hedges [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gross Amount	1.5
Offset	0.6
Net Amount in Balance Sheet	0.9
Other Current Assets [Member] | Cash Flow Hedges [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gross Amount	12.2	$ 41.8
Offset	11.7	7.9
Net Amount in Balance Sheet	0.5	33.9
Other Assets [Member] | Cash Flow Hedges [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gross Amount	3.7	9.8
Offset	3.7	4.6
Net Amount in Balance Sheet		5.2
Other Current Liabilities [Member] | Derivatives Not Designated as Hedges [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gross Amount	3.8
Offset	0.6
Net Amount in Balance Sheet	3.2
Other Current Liabilities [Member] | Cash Flow Hedges [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gross Amount	37.4	7.9
Offset	11.7	7.9
Net Amount in Balance Sheet	25.7
Other Long-term Liabilities [Member] | Cash Flow Hedges [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gross Amount	26.5	5.2
Offset	3.7	4.6
Net Amount in Balance Sheet	$ 22.8	$ 0.6