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Revenue from Contracts with Customers Components of Contract Assets and Contract Liabilities (Details) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Revenue from Contract with Customer [Abstract]    
Contract with Customer, Asset, Net, Current $ 4.1 $ 3.0
Contract with Customer, Asset, Net, Noncurrent 0.0 2.8
Contract with Customer, Liability, Current 76.6 71.9
Contract with Customer, Liability, Noncurrent $ 23.2 $ 51.2