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Schedule II-Valuation and Qualifying Accounts (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Allowance For Doubtful Accounts      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year $ 12.8 $ 11.9 $ 11.2
Additions Charged to Costs and Expenses 5.5 8.1 8.2
Other Additions (Deductions) 0.0 0.0 0.0
Less Deductions 7.4 7.2 7.5
Balance at End of Year 10.9 12.8 11.9
Insurance Reserves      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year 37.6 39.0 34.6
Additions Charged to Costs and Expenses 69.7 66.9 68.2
Other Additions (Deductions) 0.0 0.0 0.0
Less Deductions 66.2 68.3 63.8
Balance at End of Year $ 41.1 $ 37.6 $ 39.0