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Income Taxes: Reconciliation of unrecognized tax benefits (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Liability for Uncertain Tax Positions, Noncurrent, Period Start $ 11.9 $ 10.6 $ 8.4
Additions for prior year tax positions 0.0 0.0 0.5
Reductions for prior year tax positions (0.3) (0.8) (0.7)
Additions for current year tax positions 2.1 2.1 2.4
Liability for Uncertain Tax Positions, Noncurrent, Period End 13.7 $ 11.9 $ 10.6
Unrecognized Tax Benefits that Would Impact Effective Tax Rate $ 6.5