Held for Sale - Schedule of Assets Held For Sale (Details) - USD ($) $ in Millions	Dec. 31, 2023	Jan. 01, 2023	Jan. 02, 2022
Assets held for sale
Cash and equivalents	$ 33.5	$ 0.0	$ 0.0
Property and equipment, net	27.8
Assets divested	291.3	$ 0.0
Disposal Group, Held-for-Sale, Not Discontinued Operations | European Staffing Operations
Assets held for sale
Cash and equivalents	33.5
Trade accounts receivable, net	200.9
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	291.3
Liabilities held for sale
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	$ 121.4