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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Deferred tax assets:    
Contract liabilities $ 45.3 $ 13.2
Equity compensation plans 22.7 20.1
Net operating loss and credit carryforwards, net 28.9 22.9
Payroll and benefits 37.6 21.8
Operating lease liabilities 51.6 47.5
Accounts receivable 18.0 26.0
Other 20.5 15.9
Total deferred tax assets 224.6 167.4
Deferred tax liabilities:    
Acquisition-related intangibles 322.2 76.5
Property and equipment 47.6 39.9
International investments 0.0 19.2
Operating lease right-of-use assets 35.6 32.5
Other 26.5 23.3
Total deferred tax liabilities 431.9 191.4
Deferred tax asset valuation allowance 17.0 16.9
Net deferred tax liabilities $ 224.3 $ 40.9