CONDENSED STATEMENTS OF EQUITY - USD ($) $ in Millions	Total	Total common shareholder's equity	Common stock	Additional paid in capital	Retained earnings
Balance at Dec. 31, 2023		$ 2,553.7	$ 95.6	$ 1,782.0	$ 676.1
Statements of equity
Net income		67.4	0.0	0.0	67.4
Equity contribution from parent		20.0	0.0	20.0	0.0
Payment of dividends to parent		(80.0)	0.0	0.0	(80.0)
Stock-based compensation and other		0.2	0.0	0.2	0.0
Balance at Mar. 31, 2024		2,561.3	95.6	1,802.2	663.5
Balance at Dec. 31, 2023		2,553.7	95.6	1,782.0	676.1
Statements of equity
Net income	$ 111.1
Equity contribution from parent	75.0
Payment of dividends to parent	(110.0)
Balance at Jun. 30, 2024		2,630.0	95.6	1,857.2	677.2
Balance at Mar. 31, 2024		2,561.3	95.6	1,802.2	663.5
Statements of equity
Net income	43.7	43.7	0.0	0.0	43.7
Equity contribution from parent		55.0	0.0	55.0	0.0
Payment of dividends to parent		(30.0)	0.0	0.0	(30.0)
Balance at Jun. 30, 2024		2,630.0	95.6	1,857.2	677.2
Balance at Dec. 31, 2024		2,711.8	95.6	1,857.2	759.0
Statements of equity
Net income		75.8	0.0	0.0	75.8
Payment of dividends to parent		(30.0)	0.0	0.0	(30.0)
Stock-based compensation and other		0.1	0.0	0.1	0.0
Balance at Mar. 31, 2025		2,757.7	95.6	1,857.3	804.8
Balance at Dec. 31, 2024		2,711.8	95.6	1,857.2	759.0
Statements of equity
Net income	131.0
Equity contribution from parent	0.0
Payment of dividends to parent	(60.0)
Balance at Jun. 30, 2025		2,783.0	95.6	1,857.4	830.0
Balance at Mar. 31, 2025		2,757.7	95.6	1,857.3	804.8
Statements of equity
Net income	$ 55.2	55.2	0.0	0.0	55.2
Payment of dividends to parent		(30.0)	0.0	0.0	(30.0)
Stock-based compensation and other		0.1	0.0	0.1	0.0
Balance at Jun. 30, 2025		$ 2,783.0	$ 95.6	$ 1,857.4	$ 830.0