CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Income Statement [Abstract]
Revenues	$ 3,980.4	$ 4,099.7	$ 4,450.6
Cost of services	2,831.3	2,916.0	3,170.6
Gross profit	1,149.1	1,183.7	1,280.0
Selling, general, and administrative expenses	854.0	821.2	844.2
Amortization of intangible assets	64.8	58.1	71.7
Operating income	230.3	304.4	364.1
Interest expense, net	(67.7)	(64.3)	(66.4)
Income before income taxes	162.6	240.1	297.7
Provision for income taxes	49.1	64.9	78.4
Net income	$ 113.5	$ 175.2	$ 219.3
Earnings per share:
Earnings per share (in dollars per share)	$ 2.62	$ 3.88	$ 4.54
Earnings per share (in dollars per share)	$ 2.60	$ 3.83	$ 4.50
Shares and share equivalents used to calculate earnings per share:
Basic (in shares)	43.4	45.2	48.3
Diluted (in shares)	43.6	45.7	48.7
Reconciliation of net income to comprehensive income:
Net income	$ 113.5	$ 175.2	$ 219.3
Foreign currency translation adjustment	3.4	(5.0)	2.7
Comprehensive Income (Loss), Net of Tax, Attributable to Parent, Total	$ 116.9	$ 170.2	$ 222.0