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Revenue Recognition Contract Assets and Liabilities (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Revenue Recognition [Abstract]      
Receivables from contracts with customers, net $ 553.0 $ 553.0 $ 706.7
Contract Asset (Current) 26.3 26.3 28.2
Contract Asset (Long-Term) 8.6 8.6 17.4
Contract Liability (Current) 31.8 31.8 31.6
Contract Liability (Long-Term) 57.8 57.8 $ 61.9
Revenue recognized in period from amounts included in contract liability at the beginning of the period 8.5 21.5  
Revenue recognized in period from performance obligations satisfied in previous periods $ 2.3 6.9  
Contract assets reclassified to receivables   $ 27.0