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Revenue Recognition (Contract Assets and Liabilities) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Revenue Recognition [Abstract]          
Receivables from contracts with customers, net $ 464.2   $ 464.2   $ 539.9
Contract Asset (Current) 28.9   28.9   30.4
Contract Asset (Long-Term) 9.2   9.2   14.2
Contract Liability (Current) 41.5   41.5   33.6
Contract Liability (Long-Term) 65.5   65.5   $ 60.5
Amounts included in contract liability at the beginning of the period 8.1 $ 7.9 25.9 $ 24.8  
Performance obligations satisfied in previous periods $ (0.9) $ 5.2 3.8 16.3  
Contract assets reclassified to receivables     $ 30.5 $ 24.6