Income Taxes - Net Deferred Tax Assets (Liabilities) (Details) - USD ($) $ in Millions	Jan. 01, 2024	Dec. 31, 2023
Deferred tax assets (DTAs) related to:
Deferred revenue	$ 636.3	$ 0.0
Goodwill	385.2	0.0
Net operating losses (NOLs)	198.9	473.1
Intangible assets	168.0	(40.0)
Tax credits	167.6	167.6
Deferred interest	44.0	44.0
Operating lease liabilities	31.8	15.3
Accrued expenses	24.2	0.0
Investment in Desert Newco	0.0	697.2
Other	27.2	9.3
Valuation allowance	(167.0)	(377.5)
Total DTAs	1,516.2	989.0
Deferred tax liabilities (DTLs) related to:
Deferred cost of revenue	(149.2)	0.0
Unrealized gains	(71.9)	0.0
Operating lease assets	(18.1)	(6.4)
Original issue discount and debt issuance costs	(14.0)	0.0
Total DTLs	(253.2)	(6.4)
Net DTAs	$ 1,263.0	$ 982.6