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Revenue from Contracts with Customers Components of Contract Assets and Contract Liabilities (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Revenue from Contract with Customer [Abstract]    
Contract with Customer, Asset, after Allowance for Credit Loss, Current $ 7.0 $ 3.5
Contract with Customer, Asset, after Allowance for Credit Loss, Noncurrent 0.1 0.0
Contract with Customer, Liability, Current 38.9 30.0
Contract with Customer, Liability, Noncurrent $ 7.1 $ 9.7