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Revenue Recognition Contract Assets and Liabilities (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Revenue Recognition [Abstract]          
Receivables from contracts with customers, net $ 462.9   $ 462.9   $ 595.0
Contract Asset (Current) 31.0   31.0   25.7
Contract Asset (Long-Term) 10.1   10.1   10.2
Contract Liability (Current) 33.4   33.4   32.5
Contract Liability (Long-Term) 59.7   59.7   $ 56.0
Revenue recognized in period from amounts included in contract liability at the beginning of the period 7.9 $ 5.9 24.8 $ 24.7  
Revenue recognized in period from performance obligations satisfied in previous periods $ 5.2 $ 9.9 16.3 13.8  
Contract assets reclassified to receivables     $ 24.6 $ 24.4