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Schedule II-Valuation and Qualifying Accounts (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Allowance For Credit Losses      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year $ 12.0 $ 12.3 $ 10.9
"Additions/ (Reductions)" to Costs and Expenses (1.8) 2.5 7.5
"Other" Additions (Deductions) 0.0 0.0 0.0
"Less" Deductions 1.9 2.8 6.1
Balance at End of Year 8.3 12.0 12.3
Insurance Reserves      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at Beginning of Year 35.7 41.0 41.1
"Additions/ (Reductions)" to Costs and Expenses 78.2 78.6 72.1
"Other" Additions (Deductions) 0.0 0.0 0.0
"Less" Deductions 73.5 83.9 72.2
Balance at End of Year $ 40.4 $ 35.7 $ 41.0