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Revenue Recognition Contract Assets and Liabilities (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Jan. 01, 2018
Revenue Recognition [Abstract]    
Receivables from contracts with customers, net $ 671.8 $ 854.3
Contract Asset (Current) 19.5 18.4
Contract Asset (Long-Term) 5.9 1.4
Contract Liability (Current) 28.5 26.7
Contract Liability (Long-Term) 63.6 $ 63.8
Amounts included in contract liability at the beginning of the period 7.5  
Performance obligations satisfied in previous periods 5.9  
Contract assets reclassified to receivables $ 8.3