v3.26.1
CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Statement of Other Comprehensive Income [Abstract]        
Net income $ 301.0 $ 243.0 $ 1,107.1 $ 968.5
Derivatives accounted for as cash flow hedges        
Reclassification of realized derivative gains to net income, net of tax 0.0 (0.1) 0.0 (0.2)
Defined benefit plans        
Amortization of pension and OPEB costs included in net periodic benefit cost, net of tax 0.0 0.1 0.1 0.1
Other comprehensive income (loss), net of tax 0.0 0.0 0.1 (0.1)
Comprehensive income 301.0 243.0 1,107.2 968.4
Preferred stock dividends of subsidiary 0.3 0.3 0.6 0.6
Comprehensive (income) loss attributed to noncontrolling interests (1.5) 2.7 (2.9) 1.7
Comprehensive income attributed to common shareholders $ 299.2 $ 245.4 $ 1,103.7 $ 969.5