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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS - Valuation and Qualifying Accounts (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Allowance for Credit Losses      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning $ 57.7 $ 45.3 $ 43.0
Charged to Expense or Other Accounts 65.7 20.6 7.7
Write-offs and Other Adjustments (25.8) (8.2) (5.4)
Balance at End of Period 97.6 57.7 45.3
Valuation Allowance for Deferred Tax Assets      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning 38.3 59.3 59.0
Charged to Expense or Other Accounts 201.6 0.0 4.7
Write-offs and Other Adjustments 11.4 (21.0) (4.4)
Balance at End of Period $ 251.3 $ 38.3 $ 59.3