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External Debt and Financing Arrangements - Components of Long-Term Debt (Detail) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Total debt $ 2,709.8 $ 2,572.2
Less: current portion 400.0  
Long-term debt 2,309.8 2,572.2
Senior Notes [Member]    
Debt Instrument [Line Items]    
Total debt 1,789.8 1,787.2
2019 Revolving Credit Agreement [Member]    
Debt Instrument [Line Items]    
Total debt 520.0 $ 785.0
2021 Term Loan [Member]    
Debt Instrument [Line Items]    
Total debt $ 400.0