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Revenue Recognition Contract Assets & Liabilities (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Jan. 01, 2020
Dec. 31, 2019
Disaggregation of Revenue [Line Items]      
Contract with Customer, Asset, after Allowance for Credit Loss $ 389.8   $ 419.3
Contract with Customer, Asset, Allowance for Credit Loss (3.2) $ (1.7) 0.0
Contract with Customer, Asset, before Allowance for Credit Loss 386.6   419.3
Contract with Customer, Liability $ 85.7   $ 87.7