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Derivative Instruments and Hedging Activities - Schedule of Amounts Recorded On Balance Sheet Related To Cumulative Basis Adjustments For Fair Value Hedges (Detail) - USD ($)
$ in Millions
Sep. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Derivative Instruments Gain Loss [Line Items]      
Current portion of long-term debt $ 1,045.7   $ 500.0
Fair value hedges of fixed rate obligations   $ 1,000.0  
Carrying Amount of Hedged Liabilities [Member]      
Derivative Instruments Gain Loss [Line Items]      
Current portion of long-term debt     303.0
Fair value hedges of fixed rate obligations 986.1    
Cumulative Amount of Fair Value Hedging Adjustment Included in Carrying Amount of Hedged Liabilities [Member] | Long Term Debt Current [Member]      
Derivative Instruments Gain Loss [Line Items]      
Long-term debt     $ 3.1
Cumulative Amount of Fair Value Hedging Adjustment Included in Carrying Amount of Hedged Liabilities [Member] | Long Term Debt Noncurrent [Member]      
Derivative Instruments Gain Loss [Line Items]      
Long-term debt $ (9.4)