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Fair Value Financial Instruments (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Carrying Amount [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents $ 692.0 $ 574.0
Receivables, net 851.6 881.1
Accounts payable 762.3 769.1
Structured accounts payable arrangements 797.5 640.0
Short-term debt 15.1 0.1
Long-term debt, including current portion 4,469.5 4,578.0
Fair Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 692.0 574.0
Receivables, net 851.6 881.1
Accounts payable 762.3 769.1
Structured accounts payable arrangements 797.5 640.0
Short-term debt 15.1 0.1
Long-term debt, including current portion $ 4,950.8 $ 5,172.1