Share-based Compensation Plans: Restricted Stock (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation expense	$ 13.0
Weighted-average recognition period	2 years
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	231,942	164,687
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value	$ 56.68	$ 64.81
Performance Shares, Granted in Period	180,676
Granted (usd per share)	$ 53.58	$ 63.33	$ 69.03
Shares Vested	(83,737)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value	$ 65.11
Shares Forfeited	(29,684)
Forfeited (usd per share)	$ 59.13
Restricted Stock and RSUs, total fair value of shares vested	$ 4.5	$ 5.9	$ 6.4
Unrecognized compensation expense	$ 8.6
Weighted-average recognition period	2 years 1 month 6 days

Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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