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Revenue Recognition (Contract Assets and Liabilities) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Revenue Recognition [Abstract]          
Receivables from contracts with customers, net $ 640.6   $ 640.6   $ 762.0
Contract Asset (Current) 18.8   18.8   23.1
Contract Asset (Long-Term) 2.1   2.1   3.2
Contract Liability (Current) 43.6   43.6   42.5
Contract Liability (Long-Term) 72.6   72.6   $ 70.6
Amounts included in contract liability at the beginning of the period 9.5 $ 9.0 19.3 $ 18.4  
Performance obligations satisfied in previous periods $ (0.7) $ (0.3) (0.4) (2.6)  
Contract assets reclassified to receivables     $ 23.8 $ 28.7