Income Taxes - Schedule of Components of Company's Net Deferred Tax Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Non-current deferred tax liabilities:
Intangible assets	$ 700.7	$ 631.6
Fixed assets	23.0	21.1
Right-of-use assets	43.1	48.3
Net unrealized holding (loss)/gain on available-for-sale securities	(0.3)	(0.4)
Total non-current deferred tax liabilities	791.5	720.4
Non-current deferred tax assets:
Deferred compensation	85.1	67.4
Accruals and reserves	19.4	12.5
Lease liabilities	48.9	54.6
Net operating loss carryforwards and other carryforwards	23.3	3.0
Valuation allowance for deferred tax assets	(1.4)	(1.1)
Total non-current deferred tax assets	175.3	136.4
Net non-current deferred tax liability	616.2	584.0
Accounting Standards Update 2014-09
Non-current deferred tax liabilities:
Deferred Tax Liabilities, Other	$ 25.0	$ 19.8