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Revenue Recognition (Contract Assets and Liabilities) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Revenue Recognition [Abstract]          
Receivables from contracts with customers, net $ 629.1   $ 629.1   $ 634.5
Contract Asset (Current) 22.5   22.5   27.7
Contract Asset (Long-Term) 3.4   3.4   8.6
Contract Liability (Current) 41.9   41.9   41.8
Contract Liability (Long-Term) 70.0   70.0   $ 66.6
Amounts included in contract liability at the beginning of the period 8.5 $ 8.1 26.9 $ 25.9  
Performance obligations satisfied in previous periods $ 4.1 $ (0.9) 1.5 3.8  
Contract assets reclassified to receivables     $ 28.7 $ 30.5