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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)
 12 Months Ended
Dec. 31, 2023
Accounting Policies [Abstract]  
Schedule of Accumulated Other Comprehensive Loss
The components of accumulated other comprehensive loss, net of tax, were as follows (in millions):
 As of December 31,
 20232022
Foreign currency translation loss$(17.6)$(29.1)
Total accumulated other comprehensive loss$(17.6)$(29.1)
Schedule of Stock-Based Compensation Expense for Stock Options and Restricted Stock
Stock-based compensation expense for stock options, restricted stock awards and restricted stock units issued under equity incentive plans, stock purchases under the ESPP, DSUs and Matching RSUs awarded under the MSPP included in the Company’s consolidated statements of operations were as follows (in millions):
 Year Ended December 31,
 202320222021
Cost of revenues$14.3 $12.6 $11.2 
Selling and marketing (excluding customer base amortization) 9.1 7.8 7.8 6.3 
Software development17.5 13.0 12.5 
General and administrative44.1 41.8 33.7 
Total stock-based compensation expense
$85.0 $75.2 $63.7 
Schedule of Property and Equipment Depreciation and amortization are calculated on a straight-line basis over the following estimated useful lives of the assets:
Buildings
Twenty to thirty-nine years
LandIndefinite
Aircrafts
Ten to twenty years
Furniture and office equipment
Five to ten years
Vehicles
Four to five years
Computer hardware and software
Three to five years
Leasehold improvementsShorter of lease terms or useful life
Property and equipment consists of the following (in millions):
 December 31,
 20232022
Leasehold improvements$87.8 $108.9 
Furniture, office equipment and vehicles73.4 52.6 
Computer hardware and software56.3 43.8 
Aircrafts44.2 44.2 
Land52.2 52.2 
Buildings263.8 105.1 
Property and equipment, gross577.7 406.8 
Accumulated depreciation and amortization(105.5)(85.5)
Property and equipment, net$472.2 $321.3