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External Debt and Financing Arrangements - Components of Long-Term Debt (Detail) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Long-term debt $ 2,184.3 $ 2,334.0
Less: current portion 399.7 525.0
Long-term debt 1,784.6 1,809.0
Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Long-term debt   320.0
Senior Notes [Member]    
Debt Instrument [Line Items]    
Long-term debt $ 2,184.3 1,489.0
Term Loan [Member]    
Debt Instrument [Line Items]    
Long-term debt   $ 525.0