Supplementary Unrestricted Subsidiary Information - Schedule of Consolidated Balance Sheet of Such Unrestricted Subsidiaries (Details) - USD ($) $ in Millions	Sep. 30, 2025	Jun. 30, 2025	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023
Current assets:
Cash and cash equivalents	$ 158.0		$ 155.6
Restricted cash	73.9		28.2
Accounts receivable, net	345.3		51.5
Prepaid expenses	104.0		16.2
Other current assets	193.0		18.1
Total current assets	874.2		269.6
Goodwill	1,164.3		157.4
Intangible assets, net	1,352.4		275.4
Property, plant and equipment, net	8,059.4		4,209.7
Operating lease right-of-use assets, net	541.4		126.8
Deferred income tax assets, net	0.0		128.0
Other assets	87.5		115.2
Total assets	12,079.2		5,282.1
Current liabilities:
Accounts payable	161.9		13.6
Deferred revenue	185.2		84.5
Current portion of operating lease obligations	124.3		12.7
Accrued interest	161.5		143.9
Other current liabilities	371.1		118.9
Total current liabilities	1,070.3		380.7
Notes and other debt, net	9,285.1		5,783.6
Noncurrent operating lease obligations	381.3		67.8
Noncurrent deferred revenue	379.4		1,316.5
Deferred income tax assets, net	13.7		0.0
Total liabilities	11,398.4		7,734.0
Shareholders' (deficit) equity:
Total shareholders' equity (deficit)	680.8	$ (2,444.1)	(2,451.9)	$ (2,476.3)	$ (2,492.4)	$ (2,484.1)
Total liabilities and shareholders' equity (deficit)	12,079.2		5,282.1
Eliminations
Current assets:
Cash and cash equivalents	0.0		0.0
Restricted cash	0.0		0.0
Accounts receivable, net	(38.6)		(3.9)
Prepaid expenses	0.0		0.0
Other current assets	0.0		0.0
Total current assets	(38.6)		(3.9)
Goodwill	0.0		0.0
Intangible assets, net	0.0		0.0
Property, plant and equipment, net	0.0		0.0
Operating lease right-of-use assets, net	0.0		0.0
Deferred income tax assets, net			0.0
Other assets	(31.3)		(170.5)
Total assets	(69.9)		(174.4)
Current liabilities:
Accounts payable	(38.6)		(3.9)
Deferred revenue	0.0		0.0
Current portion of operating lease obligations	0.0		0.0
Accrued taxes	0.0		0.0
Accrued interest	0.0		0.0
Other current liabilities	0.0		0.0
Total current liabilities	(38.6)		(3.9)
Notes and other debt, net	(21.3)		0.0
Noncurrent operating lease obligations	0.0		0.0
Noncurrent deferred revenue	(10.0)		0.0
Deferred income tax assets, net	0.0
Other liabilities	0.0		0.0
Total liabilities	(69.9)		(3.9)
Shareholders' (deficit) equity:
Total shareholders' equity (deficit)	0.0		(170.5)
Total liabilities and shareholders' equity (deficit)	(69.9)		(174.4)
Consolidated
Current assets:
Cash and cash equivalents	158.0		155.6
Restricted cash	73.9		28.2
Accounts receivable, net	345.3		51.5
Prepaid expenses	104.0		16.2
Other current assets	193.0		18.1
Total current assets	874.2		269.6
Goodwill	1,164.3		157.4
Intangible assets, net	1,352.4		275.4
Property, plant and equipment, net	8,059.4		4,209.7
Operating lease right-of-use assets, net	541.4		126.8
Deferred income tax assets, net			128.0
Other assets	87.5		115.2
Total assets	12,079.2		5,282.1
Current liabilities:
Accounts payable	161.9		13.6
Deferred revenue	185.2		84.5
Current portion of operating lease obligations	124.3		12.7
Accrued taxes	66.3		7.1
Accrued interest	161.5		143.9
Other current liabilities	371.1		118.9
Total current liabilities	1,070.3		380.7
Notes and other debt, net	9,285.1		5,783.6
Noncurrent operating lease obligations	381.3		67.8
Noncurrent deferred revenue	379.4		1,316.5
Deferred income tax assets, net	13.7
Other liabilities	268.6		185.4
Total liabilities	11,398.4		7,734.0
Shareholders' (deficit) equity:
Total shareholders' equity (deficit)	680.8		(2,451.9)
Total liabilities and shareholders' equity (deficit)	12,079.2		5,282.1
Unrestricted Subsidiaries
Current assets:
Cash and cash equivalents	1.9		1.7
Restricted cash	68.5		28.1
Accounts receivable, net	11.2		9.0
Prepaid expenses	0.0		0.0
Other current assets	0.0		0.1
Total current assets	81.6		38.9
Goodwill	0.0		0.0
Intangible assets, net	0.0		0.0
Property, plant and equipment, net	448.7		446.5
Operating lease right-of-use assets, net	0.0		0.0
Deferred income tax assets, net			0.0
Other assets	23.2		0.8
Total assets	553.5		486.2
Current liabilities:
Accounts payable	34.0		3.2
Deferred revenue	6.0		4.6
Current portion of operating lease obligations	0.0		0.0
Accrued taxes	2.4		0.2
Accrued interest	7.6		0.9
Other current liabilities	0.0		0.0
Total current liabilities	50.0		8.9
Notes and other debt, net	577.9		271.3
Noncurrent operating lease obligations	0.0		0.0
Noncurrent deferred revenue	51.5		38.9
Deferred income tax assets, net	0.0
Other liabilities	0.0		0.0
Total liabilities	679.4		319.1
Shareholders' (deficit) equity:
Total shareholders' equity (deficit)	(125.9)		167.2
Total liabilities and shareholders' equity (deficit)	553.5		486.3
Restricted Subsidiaries
Current assets:
Cash and cash equivalents	156.1		153.9
Restricted cash	5.4		0.1
Accounts receivable, net	372.7		46.4
Prepaid expenses	104.0		16.2
Other current assets	193.0		18.0
Total current assets	831.2		234.6
Goodwill	1,164.3		157.4
Intangible assets, net	1,352.4		275.4
Property, plant and equipment, net	7,610.7		3,763.2
Operating lease right-of-use assets, net	541.4		126.8
Deferred income tax assets, net			128.0
Other assets	95.6		284.9
Total assets	11,595.6		4,970.3
Current liabilities:
Accounts payable	166.5		14.3
Deferred revenue	179.2		79.9
Current portion of operating lease obligations	124.3		12.7
Accrued taxes	63.9		6.9
Accrued interest	153.9		143.0
Other current liabilities	371.1		118.9
Total current liabilities	1,058.9		375.7
Notes and other debt, net	8,728.5		5,512.3
Noncurrent operating lease obligations	381.3		67.8
Noncurrent deferred revenue	337.9		1,277.6
Deferred income tax assets, net	13.7
Other liabilities	268.6		185.4
Total liabilities	10,788.9		7,418.8
Shareholders' (deficit) equity:
Total shareholders' equity (deficit)	806.7		(2,448.6)
Total liabilities and shareholders' equity (deficit)	$ 11,595.6		$ 4,970.2