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Schedule II - Valuation and Qualifying Accounts and Reserves (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Accounts receivable credit loss allowance      
Movement in Valuation Allowances and Reserves      
Balance, Beginning of Year $ 1.1 $ 0.5 $ 2.0
Charged to Costs and Expenses (0.2) 0.6 0.3
Charged to Other Comprehensive Income 0.0 0.0 0.0
Charged to Retained Earnings 0.0 0.0 0.0
Write-offs (0.3) 0.0 (1.8)
Balance, End of Year 0.6 1.1 0.5
Held-to-maturity debt securities credit loss allowance      
Movement in Valuation Allowances and Reserves      
Balance, Beginning of Year 0.2 0.6 0.5
Charged to Costs and Expenses 0.0 (0.4) 0.1
Charged to Other Comprehensive Income 0.0 0.0 0.0
Charged to Retained Earnings 0.0 0.0 0.0
Write-offs 0.0 0.0 0.0
Balance, End of Year 0.2 0.2 0.6
Deferred tax valuation allowance      
Movement in Valuation Allowances and Reserves      
Balance, Beginning of Year 11.1 9.2 8.8
Charged to Costs and Expenses 1.4 1.3 0.1
Charged to Other Comprehensive Income (1.5) 0.6 0.3
Charged to Retained Earnings 0.0 0.0 0.0
Write-offs 0.0 0.0 0.0
Balance, End of Year $ 11.0 $ 11.1 $ 9.2