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Revenue Recognition Contract Assets and Liabilities (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Revenue Recognition [Abstract]      
Receivables from contracts with customers, net $ 650.3   $ 595.0
Contract Asset (Current) 18.6   25.7
Contract Asset (Long-Term) 5.3   10.2
Contract Liability (Current) 32.6   32.5
Contract Liability (Long-Term) 56.3   $ 56.0
Revenue recognized in period from amounts included in contract liability at the beginning of the period 8.7 $ 8.5  
Revenue recognized in period from performance obligations satisfied in previous periods 5.4 0.0  
Contract assets reclassified to receivables $ 17.6 $ 14.5