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Revenue Recognition Contract Assets & Liabilities (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Disaggregation of Revenue [Line Items]    
Contract with Customer, Asset, after Allowance for Credit Loss $ 345.9 $ 345.7
Contract with Customer, Asset, Allowance for Credit Loss (2.4) (2.1)
Contract with Customer, Asset, before Allowance for Credit Loss 348.3 347.8
Contract with Customer, Liability $ 105.4 $ 111.0