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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

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- Definition The tax effect as of the balance sheet date of the amount of the estimated future tax deductions arising from estimated policyholder reserves, which will be deductible from future taxable income when actual costs are incurred, and which can only be realized if sufficient tax-basis income is generated in future periods to enable the tax deduction to be taken. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-6 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-8 + Details
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