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Revenue from Contracts with Customers Schedule of Contract Assets and Liabilities (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Revenue from Contract with Customer [Abstract]    
Contract with Customer, Asset, Net $ 4.1 $ 5.8
Contract with Customer, Liability 99.8 $ 123.1
Contract with Customer, Liability, Increase from Cash Receipts 27.6  
Contract with Customer, Liability, Revenue Recognized, Included In Beginning Balance (43.0)  
Contract with Customer, Liability, Revenue Recognized, Added During Period (7.9)  
Contract with Customer, Asset, Reclassified to Receivable $ (1.7)