Consolidated Statements of Shareholders' Equity - USD ($) $ in Millions	Total	Equity	Equity	Accumulated Other Comprehensive Income/(Loss) [Member]	Common Stock [Member]	Equity	Accumulated Other Comprehensive Income/(Loss) [Member]	Common Stock [Member]	Other Paid-In Capital [Member]	Other Paid-In Capital [Member] Other Paid-In Capital [Member]	Accumulated Other Comprehensive Income/(Loss) [Member]	Cash and Noncash Contribution from Noncontrolling Interest
Other paid-in capital	$ 2,601.3
Accumulated other comprehensive income/(loss)	(2.4)
Retained earnings / (deficit)	(2,722.6)
Other Comprehensive Income (Loss), Net of Tax	(2.2)
Balance at Dec. 31, 2022	(123.7)							$ 0.0
Balance (in shares) at Dec. 31, 2022								1
NET INCOME	35.7
Equity Contribution from Parent	(239.0)								$ (239.0)
Other	0.1								0.1
Balance at Dec. 31, 2023	148.9							$ 0.0
Balance (in shares) at Dec. 31, 2023								1
Non-cash capital contribution	239.0
Proceeds from Issuance of Common Stock	0.0
Payments of Ordinary Dividends	0.0
Other paid-in capital	2,840.4
Accumulated other comprehensive income/(loss)	(4.6)
Retained earnings / (deficit)	(2,686.9)
Other Comprehensive Income (Loss), Net of Tax	(0.7)
NET INCOME	13.8
Equity Contribution from Parent	(200.0)								(200.0)
Other	(0.1)								(0.1)
Balance at Dec. 31, 2024	362.1							$ 0.0
Balance (in shares) at Dec. 31, 2024								1
Non-cash capital contribution	200.0
Proceeds from Issuance of Common Stock	0.0
Payments of Ordinary Dividends	0.0
Other paid-in capital	3,040.5
Accumulated other comprehensive income/(loss)	(5.3)
Retained earnings / (deficit)	(2,673.1)
Other Comprehensive Income (Loss), Net of Tax	1.8										$ 21.0
NET INCOME	21.0
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent	0.8			$ 2.7			$ 17.5
Equity Contribution from Parent	0.0
Other	(0.9)
Balance at Dec. 31, 2025								$ 0.0	$ 0.0	$ (3,040.5)
Balance (in shares) at Dec. 31, 2025					(1)			0
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest	12.0
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Noncontrolling Interest	1.0
Proceeds from Noncontrolling Interests	537.5
Proceeds from Issuance of Common Stock	45.0											$ 53.6
Payments of Ordinary Dividends	(8.6)
Other Noncontrolling Interests	(0.8)
Members' Equity	3,049.3	$ 10.6	$ (2.7)			$ 3,040.5
AOCI Tax, Attributable to Parent	28.1
Redeemable Noncontrolling Interest, Equity, Carrying Amount	594.7
Accumulated other comprehensive income/(loss)	15.7
Retained earnings / (deficit)	(2,652.1)
Equity, Attributable to Parent	$ 412.9