Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Deferred tax assets:
Contract liabilities	$ 38.4	$ 46.3
Equity compensation plans	34.5	31.3
Net operating loss and credit carryforwards, net	17.0	17.0
Payroll and benefits	17.2	24.3
Operating lease liabilities	45.6	48.5
Accounts receivable	20.1	18.1
Other	19.9	19.5
Total deferred tax assets	192.7	205.0
Deferred tax liabilities:
Acquisition-related intangibles	269.8	293.3
Property and equipment	22.4	38.1
Operating lease right-of-use assets	27.6	32.9
Other	26.7	27.1
Total deferred tax liabilities	346.5	391.4
Deferred tax asset valuation allowance	17.0	17.0
Net deferred tax liabilities	$ 170.8	$ 203.4