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Business Description And Significant Accounting Policies: Earnings Per Share Reconciliation (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Net income available for common stock	$ 273.1	$ 262.2	$ 258.4
Weighted average shares - Basic (in shares)	69.8	67.0	64.9
Dilutive effect of equity compensation	0.1	0.1	0.1
Weighted average shares - diluted (in shares)	69.9	67.1	65.0
Net income available for common stock, per share - Diluted	$ 3.91	$ 3.91	$ 3.97

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