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Credit Losses (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Credit Loss [Abstract]    
Reinsurance Recoverable, Allowance for Credit Loss, Beginning Balance $ 3.8 $ 3.7
Reinsurance Recoverable, Allowance for Credit Loss, Period Increase (Decrease) (0.5) 0.1
Reinsurance Recoverable, Allowance for Credit Loss, Ending Balance 3.3 3.8
Accounts Receivable, Allowance for Credit Loss, Beginning Balance 34.0 23.0
Accounts Receivable, Allowance for Credit Loss, Period Increase (Decrease) (3.8) 11.0
Accounts Receivable, Allowance for Credit Loss, Ending Balance 30.2 34.0
Available-for-sale Investments, Allowance for Credit Loss, Beginning Balance 0.2 0.6
Available-for-sale investment, allowance for credit loss, increase (decrease) 2.5 (0.4)
Available-for-sale Investments, Allowance for Credit Loss, Current 2.7 0.2
Total, Allowance for Credit Loss, Beginning Balance 38.0 27.3
Total allowance for credit losses increase (decrease) (1.8) 10.7
Total, Allowance for Credit Loss, Ending Balance $ 36.2 $ 38.0