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Basis of Presentation (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
Proceeds from Interest Received $ (0.2) $ 9.8        
Accounts Receivable, Allowance for Credit Loss 135.5 146.1 $ 136.6 $ 144.3 $ 129.1 $ 73.0
Off-Balance Sheet, Credit Loss, Liability 3.4 2.3 $ 3.4 3.7 $ 2.1 0.0
Deferred tax liability, net (25.2)     (27.2)    
Retained Earnings (Accumulated Deficit) $ 1,005.2     962.1    
Cumulative effect, period of adoption, adjusted balance            
Off-Balance Sheet, Credit Loss, Liability   $ 2.3   $ 0.0   $ 0.0