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
Net Income	$ 256.9	$ 335.6	$ 488.9	$ 524.7
Net Other Comprehensive Income	(74.5)	138.1	(61.5)	483.0
Comprehensive Income	182.4	473.7	427.4	1,007.7
Net Unrealized Loss on Securities
Net Other Comprehensive Income	139.5	79.5	(289.7)	501.5
Effect of Change in Discount Rate Assumptions on the LFPB
Net Other Comprehensive Income	(220.6)	39.8	244.6	(126.5)
Net Loss on Derivatives
Net Other Comprehensive Income	2.9	(59.8)	(0.4)	(14.3)
Foreign Currency Translation Adjustment
Net Other Comprehensive Income	1.9	80.0	(21.1)	122.3
Unrecognized Pension and Postretirement Benefit Costs
Net Other Comprehensive Income	$ 1.8	$ (1.4)	$ 5.1	$ 0.0