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Schedule II Valuation and Qualifying Accounts (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Allowance For Doubtful Accounts      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
SEC Schedule, 12-09, Valuation Allowances and Reserves, Business Acquired [1]     $ 12.0
Accounts Receivable, Allowance for Credit Loss, Noncurrent $ 16.3 $ 16.7 22.1
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance Beginning of Period 20.2 [2] 23.4 [2] 15.5
Charges or (Reductions) to Costs and Expenses (1.3) (4.6) 0.0
Charges or (Reductions) to Other Accounts (0.2) (6.8) [1] (12.0) [1]
Deductions (4.5) (1.0) (4.1)
Balance at End of Period [2] 16.8 20.2 23.4
Valuation Allowance Of Deferred Tax Assets      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance Beginning of Period 1,457.1 [1] 1,530.5 [1] 584.1
Charges or (Reductions) to Costs and Expenses (774.1) (73.4) (946.4)
Charges or (Reductions) to Other Accounts 0.0 0.0 0.0
Deductions 0.0 0.0 0.0
Balance at End of Period [1] $ 683.0 $ 1,457.1 $ 1,530.5
[1] Amount relates to allowance of $12.0 million acquired in the Acquisition.
[2] Allowance for doubtful accounts balance includes $16.3 million, $16.7 million, $22.1 million of allowance on long-term receivables recorded in Other Assets for the years ended December 31, 2020, 2019 and 2018, respectively.