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Revenue Recognition - Assets and Liabilities (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Revenue from Contract with Customer [Abstract]    
Receivables from contracts with customers, net of allowances $ 2,631.1 $ 2,433.8
Receivables from contracts with customers, net of allowances, increase (decrease) 197.3  
Contract with customer, liability 12.0 $ 347.1
Increase (decrease) in contract liabilities $ (335.1)