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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Deferred tax assets:    
Contract liabilities $ 13.2 $ 46.3
Equity compensation plans 20.1 21.1
Net operating loss and credit carryforwards, net 22.9 20.1
Payroll and benefits 21.8 9.6
Operating lease liabilities 47.5 41.0
Accounts receivable 26.0 15.6
Other 15.9 14.1
Total deferred tax assets 167.4 167.8
Deferred tax liabilities:    
Acquisition-related intangibles 76.5 112.2
Property and equipment 39.9 27.0
International investments 19.2 19.2
Operating lease right-of-use assets 32.5 33.7
Other 23.3 17.5
Total deferred tax liabilities 191.4 209.6
Deferred tax asset valuation allowance 16.9 16.8
Net deferred tax liabilities $ 40.9 $ 58.6