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Revenue Recognition - Assets and Liabilities (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Revenue from Contract with Customer [Abstract]      
Receivables from contracts with customers, net of allowances (1) $ 2,573.1   $ 2,433.8
Receivables from contracts with customers, net of allowances, increase (decrease) 139.3    
Contract with customer, liability 3.2   $ 347.1
Advance payments from customers $ (343.9) $ (487.4)