Acquisitions and Dispositions - Schedule of Divested Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 29, 2024	Jan. 02, 2024	Dec. 31, 2023	Jan. 01, 2023
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash and equivalents	$ 0.0		$ 33.5	$ 0.0
Assets divested	$ 0.0		$ 291.3
Disposal Group, Not Discontinued Operations | European Staffing Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash and equivalents		$ 33.5
Trade accounts receivable, net		202.8
Prepaid expenses and other current assets		29.0
Property and equipment, net		4.2
Operating lease right-of-use assets		14.2
Deferred taxes		4.1
Other assets		5.4
Assets divested		293.2
Accounts payable and accrued liabilities		(24.5)
Operating lease liabilities, current		(5.7)
Accrued payroll and related taxes		(91.6)
Income and other taxes		(32.9)
Operating lease liabilities, noncurrent		(8.9)
Accrued retirement benefits		(1.7)
Other long-term liabilities		(4.6)
Liabilities divested		(169.9)
Disposal group, net		$ 123.3