Notes and Other Debt, Net - Schedule of Notes and Other Debt (Details) - USD ($) $ in Millions	Sep. 30, 2025	Feb. 03, 2025	Dec. 31, 2024
Debt Instrument [Line Items]
Total principal amount	$ 9,261.5		$ 5,861.5
Unamortized premium (discount) and deferred financing costs	23.6		(77.9)
Notes and other debt, net	9,285.1		5,783.6
Senior secured revolving credit facility - variable rate, due September 24, 2027
Debt Instrument [Line Items]
Total principal amount	281.0		0.0
Unamortized premium (discount) and deferred financing costs	(3.3)		(4.3)
Senior secured revolving credit facility - variable rate, due January 23, 2027
Debt Instrument [Line Items]
Total principal amount	130.0		0.0
Unamortized premium (discount) and deferred financing costs	0.0		0.0
Senior secured Windstream term loan - variable rate, due October 1, 2031 (premium is based on imputed interest rate of 9.15%)
Debt Instrument [Line Items]
Total principal amount	500.0		0.0
Unamortized premium (discount) and deferred financing costs	$ 1.2		0.0
Effective interest rate	9.15%
Senior secured notes - 10.50%, due February 15, 2028 (discount is based on imputed interest rate of 10.99%)
Debt Instrument [Line Items]
Total principal amount	$ 2,275.0		2,900.0
Unamortized premium (discount) and deferred financing costs	$ (23.2)		(37.5)
Issuance senior notes, stated percentage	10.50%
Effective interest rate	10.99%
Senior secured notes - 4.75%, due April 15, 2028 (discount is based on imputed interest rate of 5.04%)
Debt Instrument [Line Items]
Total principal amount	$ 570.0		570.0
Unamortized premium (discount) and deferred financing costs	$ (3.9)		(5.0)
Issuance senior notes, stated percentage	4.75%
Effective interest rate	5.04%
Senior secured notes - 8.250%, due October 1, 2031 (premium is based on imputed interest rate of 7.29%)
Debt Instrument [Line Items]
Total principal amount	$ 2,200.0		0.0
Unamortized premium (discount) and deferred financing costs	$ 102.7		0.0
Issuance senior notes, stated percentage	8.25%
Effective interest rate	7.29%
Senior unsecured notes - 6.50%, due February 15, 2029 (discount is based on imputed interest rate of 6.83%)
Debt Instrument [Line Items]
Total principal amount	$ 1,110.0		1,110.0
Unamortized premium (discount) and deferred financing costs	$ (11.0)		(13.1)
Issuance senior notes, stated percentage	6.50%
Effective interest rate	6.83%
Senior unsecured notes - 6.00% due January 15, 2030 (discount is based on imputed interest rate of 6.27%)
Debt Instrument [Line Items]
Total principal amount	$ 700.0		700.0
Unamortized premium (discount) and deferred financing costs	$ (6.9)		(8.0)
Issuance senior notes, stated percentage	6.00%
Effective interest rate	6.27%
Senior unsecured notes - 8.625% due June 15, 2032 (discount is based on imputed interest rate of 9.16%)
Debt Instrument [Line Items]
Total principal amount	$ 600.0		0.0
Unamortized premium (discount) and deferred financing costs	$ (16.1)		0.0
Issuance senior notes, stated percentage	8.625%
Effective interest rate	9.16%
Convertible senior notes - 7.50%, due December 1, 2027 (discount is based on imputed interest rate of 8.29%)
Debt Instrument [Line Items]
Total principal amount	$ 306.5		306.5
Unamortized premium (discount) and deferred financing costs	$ (4.8)		(6.3)
Issuance senior notes, stated percentage	7.50%
Effective interest rate	8.29%
ABS Bridge Loan Facility - variable rate, due September 1, 2025 (discount is based on imputed interest rate of 10.33%)
Debt Instrument [Line Items]
Total principal amount	$ 0.0	$ 589.0	275.0
Unamortized premium (discount) and deferred financing costs	$ 0.0		(3.7)
Effective interest rate	10.33%
ABS Notes (Class A-2) - 5.877%, due April 1, 2030 (discount is based on imputed interest rate of 6.36%)
Debt Instrument [Line Items]
Total principal amount	$ 426.0	426.0	0.0
Unamortized premium (discount) and deferred financing costs	$ (8.0)		0.0
Issuance senior notes, stated percentage	5.877%
Effective interest rate	6.36%
ABS Notes (Class B) - 6.369%, due April 1, 2030 (discount is based on imputed interest rate of 6.86%)
Debt Instrument [Line Items]
Total principal amount	$ 65.0	65.0	0.0
Unamortized premium (discount) and deferred financing costs	$ (1.2)		0.0
Issuance senior notes, stated percentage	6.369%
Effective interest rate	6.86%
ABS Notes (Class C) - 9.018%, due April 1, 2030 (discount is based on imputed interest rate of 9.54%)
Debt Instrument [Line Items]
Total principal amount	$ 98.0	$ 98.0	0.0
Unamortized premium (discount) and deferred financing costs	$ (1.9)		$ 0.0
Issuance senior notes, stated percentage	9.018%
Effective interest rate	9.54%