Notes and Other Debt, Net - Debt Restructuring Subsequent to the Merger (Narrative) (Details) - USD ($) $ in Millions	Sep. 30, 2025	Jun. 24, 2025	Feb. 03, 2025	Dec. 31, 2024	Oct. 13, 2021	Feb. 02, 2021
Debt Instrument [Line Items]
Total principal amount	$ 9,261.5			$ 5,861.5
Senior secured revolving credit facility - variable rate, due September 24, 2027
Debt Instrument [Line Items]
Total principal amount	281.0			0.0
Senior secured revolving credit facility - variable rate, due January 23, 2027
Debt Instrument [Line Items]
Total principal amount	130.0			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
ABS Loan Facility
Debt Instrument [Line Items]
Total principal amount	0.0		$ 589.0	275.0
5.877% Series 2025-1, Class A-2 term notes
Debt Instrument [Line Items]
Total principal amount	$ 426.0		426.0	0.0
Senior convertible notes	5.877%
Six Point Thirty Six Nine Percentage ABS Notes (Class B) Due April One Two Thounsad Thirty
Debt Instrument [Line Items]
Total principal amount	$ 65.0		65.0	0.0
Senior convertible notes	6.369%
Nine Point Zero One Eight Percentage ABS Notes (Class C) Due April One Two Thounsad Thirty
Debt Instrument [Line Items]
Total principal amount	$ 98.0		$ 98.0	0.0
Senior convertible notes	9.018%
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
Senior convertible notes	10.50%
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
Senior convertible notes	4.75%
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
Senior convertible notes	6.50%
Senior unsecured notes - 6.50%, due February 15, 2029 (discount is based on imputed interest rate of 6.83%) | Senior Unsecured Notes
Debt Instrument [Line Items]
Senior convertible notes						6.50%
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
Senior convertible notes	6.00%
Senior unsecured notes - 6.00% due January 15, 2030 (discount is based on imputed interest rate of 6.27%) | Senior Unsecured Notes
Debt Instrument [Line Items]
Senior convertible notes					6.00%
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
Senior convertible notes	8.25%
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
Senior convertible notes	8.625%
Senior unsecured notes - 8.625% due June 15, 2032 (discount is based on imputed interest rate of 9.16%) | Senior Unsecured Notes
Debt Instrument [Line Items]
Total principal amount		$ 600.0
Senior convertible notes		8.625%
Convertible Senior Notes 2027, Excluding Over-Allotment Option
Debt Instrument [Line Items]
Total principal amount	$ 306.5			$ 306.5
Senior convertible notes	7.50%