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Revenue Recognition Contract Assets and Liabilities (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2018
Jan. 01, 2018
Revenue Recognition [Abstract]      
Receivables from contracts with customers, net $ 569.7 $ 569.7 $ 854.3
Contract Asset (Current) 24.8 24.8 18.4
Contract Asset (Long-Term) 13.3 13.3 1.4
Contract Liability (Current) 31.9 31.9 26.7
Contract Liability (Long-Term) 64.4 64.4 $ 63.8
Amounts included in contract liability at the beginning of the period 6.8 21.7  
Performance obligations satisfied in previous periods $ 4.1 16.0  
Contract assets reclassified to receivables   $ 8.3