Property and Equipment - Schedule of Property and Equipment and Accumulated Depreciation and Amortization (Detail) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Property and Equipment [Line Items]
Property and equipment, gross	$ 1,201.1	$ 1,086.6
Less: accumulated depreciation and amortization	(656.1)	(576.4)
Software And Capitalized Software Development Costs [Member]
Property and Equipment [Line Items]
Property and equipment, gross	567.5	497.2
Buildings [Member]
Property and Equipment [Line Items]
Property and equipment, gross	279.1	275.6
Computer Equipment [Member]
Property and Equipment [Line Items]
Property and equipment, gross	241.1	203.2
Rental Clocks [Member]
Property and Equipment [Line Items]
Property and equipment, gross	50.4	48.0
Furniture, Fixtures and Equipment [Member]
Property and Equipment [Line Items]
Property and equipment, gross	42.4	41.9
Other [Member]
Property and Equipment [Line Items]
Property and equipment, gross	20.6	20.7
Property and Equipment, net, Excluding Land and Construction in Progress [Member]
Property and Equipment [Line Items]
Property and equipment, net	545.0	510.2
Construction in Progress [Member]
Property and Equipment [Line Items]
Property and equipment, net	20.6	14.7
Land [Member]
Property and Equipment [Line Items]
Property and equipment, net	36.5	36.5
Property and Equipment, net, Including Land and Construction in Progress [Member]
Property and Equipment [Line Items]
Property and equipment, net	$ 602.1	$ 561.4