Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Deferred tax assets:
Deferred revenue	$ 13.9	$ 0.0
Share-based compensation	9.7	13.9
Accruals not currently deductible	17.8	13.3
Finance lease liabilities	85.8	90.4
Net operating loss carryforwards	20.3	31.3
Foreign tax credit	0.0	16.9
Research and development credits	0.0	30.5
Depreciation and amortization	5.0	4.0
Disallowed interest carryforward	118.8	77.4
Operating lease liabilities	35.4	28.6
March 2024 Refinancing Transactions	100.5	0.0
Other	20.8	19.1
Total gross deferred tax assets	428.0	325.4
Valuation allowance	(173.4)	(66.1)	$ (58.5)	$ (58.3)
Total net deferred tax assets	254.6	259.3
Deferred tax liabilities:
Depreciation and amortization	204.5	265.1
Finance lease liabilities	4.4	6.6
Capitalized costs	8.8	8.7
Interest rate swaps	11.9	21.8
Operating right-of-use assets	33.3	22.7
Other	8.9	6.9
Total gross deferred tax liabilities	271.8	331.8
Net deferred tax liabilities	$ 17.2	$ 72.5