Consolidated Statements of Equity (Deficit) - USD ($) $ in Millions	Total	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Beginning Balance, Equity (Deficit) at Dec. 31, 2021	$ 1,690.1	$ 1,716.1	$ (27.2)	$ 1.2
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(130.9)		(130.9)
Other comprehensive income	18.3			18.3
Ending Balance, Equity (Deficit) at Dec. 31, 2022	1,577.5	1,716.1	(158.1)	19.5
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(192.7)		(192.7)
Other comprehensive income	8.7			8.7
Capital contributions by Red Fiber Parent LLC	400.0	400.0
Ending Balance, Equity (Deficit) at Dec. 31, 2023	1,793.5	2,116.1	(350.8)	28.2
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(129.3)		(129.3)
Other comprehensive income	6.8			6.8
Capital contributions by Red Fiber Parent LLC	200.0	200.0
Ending Balance, Equity (Deficit) at Dec. 31, 2024	$ 1,871.0	$ 2,316.1	$ (480.1)	$ 35.0