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Revenue Recognition Contract Assets & Liabilities (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Disaggregation of Revenue [Line Items]    
Contract with Customer, Asset, after Allowance for Credit Loss $ 363.7 $ 345.7
Contract with Customer, Asset, Allowance for Credit Loss (2.4) (2.1)
Contract with Customer, Asset, before Allowance for Credit Loss 366.1 347.8
Contract with Customer, Liability $ 95.7 $ 111.0