v3.26.1
Financing: At-the-Market Equity Offering Program (Details) - Common Stock - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Line of Credit Facility [Line Items]        
Proceeds, (net of issuance costs) $ 9.5 $ 19.6 $ 50.1 $ 65.3
Average price per share $ 74.04 $ 58.28 $ 73.53 $ 59.78
Number of shares issued 0.1 0.3 0.7 1.1
Payments of Stock Issuance Costs $ (0.1) $ (0.2) $ (0.5) $ (0.7)
June 16, 2023 ATM Program        
Line of Credit Facility [Line Items]        
Proceeds, (net of issuance costs) $ 0.0 $ 0.0 $ 0.0 $ 45.7
Number of shares issued 0.0 0.0 0.0 0.8
Payments of Stock Issuance Costs $ 0.0 $ (0.0) $ (0.0) $ (0.5)
May 8, 2025 ATM Program        
Line of Credit Facility [Line Items]        
Proceeds, (net of issuance costs) $ 9.5 $ 19.6 $ 50.1 $ 19.6
Number of shares issued 0.1 0.3 0.7 0.3
Payments of Stock Issuance Costs $ (0.1) $ (0.2) $ (0.5) $ (0.2)