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Valuation and Qualifying Accounts (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Reserve For Accounts Receivable [Member]      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Beginning Balance $ 19.2 $ 21.1 $ 18.3
Valuation Allowances and Reserves, Charged to Cost and Expense 31.6 21.6 20.2
Valuation Allowances and Reserves, Charged to Other Accounts 33.0 41.3 43.7
Deductions for Purposes for which Reserves were Created 31.5 64.8 61.1
Ending Balance 52.3 19.2 21.1
Reserve For Other Investments [Member]      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Beginning Balance 3.0 3.0 3.0
Valuation Allowances and Reserves, Charged to Cost and Expense 0.0 0.0 0.0
Valuation Allowances and Reserves, Charged to Other Accounts 0.0 0.0 0.0
Deductions for Purposes for which Reserves were Created 3.0 0.0 0.0
Ending Balance $ 0.0 $ 3.0 $ 3.0