Earnings (Loss) Per Share - Schedule of Earnings Per Share Basic and Diluted (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Numerator:
Net income (loss) attributable to shareholders	$ 1,304.7	$ 93.4	$ (81.7)
Less: Income allocated to participating securities	(30.6)	(2.1)	(1.2)
Less: Dividends declared on Preferred Stock	(25.4)	0.0	0.0
Net income (loss) attributable to common shareholders	$ 1,248.7	$ 91.3	$ (82.9)
Denominator:
Weighted-average common shares outstanding (in shares)	181.6	143.1	142.5
Weighted-average New Uniti Warrants outstanding (in shares)	7.4	0.0	0.0
Basic weighted-average common shares outstanding (in shares)	189.0	143.1	142.5
Basic earnings (loss) per common share (in dollars per share)	$ 6.61	$ 0.64	$ (0.58)
Numerator:
Net income (loss) attributable to common shares	$ 1,248.7	$ 91.3	$ (82.9)
Add: Dividends declared on Preferred Stock	25.4	0.0	0.0
Add: Impact on if-converted dilutive securities	24.4	0.0	0.0
Net income (loss) attributable to common shares	$ 1,298.5	$ 91.3	$ (82.9)
Denominator:
Basic weighted-average common shares outstanding (in shares)	189.0	143.1	142.5
Add: Effect of dilutive non-participating securities (in shares)	52.2	0.0	0.0
Add: Impact on if-converted dilutive securities (in shares)	25.3	0.0	0.0
Total diluted weighted-average common shares outstanding (in shares)	266.5	143.1	142.5
Diluted earnings (loss) per common share (in dollars per share)	$ 4.87	$ 0.64	$ (0.58)