Derivative Instruments and Hedging Activities - Schedule of Effects of Master Netting Agreements on Condensed Consolidated Balance Sheets (Detail) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
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	$ 22.0	12.2
Offset	13.6	11.7
Net Amount in Balance Sheet	8.4	0.5
Other Assets [Member] | Cash Flow Hedges [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gross Amount	13.8	3.7
Offset	6.3	3.7
Net Amount in Balance Sheet	7.5
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	23.1	37.4
Offset	13.6	11.7
Net Amount in Balance Sheet	9.5	25.7
Other Long-term Liabilities [Member] | Cash Flow Hedges [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Gross Amount	8.9	26.5
Offset	6.3	3.7
Net Amount in Balance Sheet	$ 2.6	$ 22.8