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Revenue from Contracts with Customers Components of Contract Assets and Contract Liabilities (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Revenue from Contract with Customer [Abstract]    
Contract with Customer, Asset, Net, Current $ 12.8 $ 4.0
Contract with Customer, Liability, Current 46.2 56.9
Contract with Customer, Liability, Noncurrent $ 14.8 $ 20.5