Fair Value Measurements - Schedule of Assets Measured at Fair Value on a Recurring Basis (Details) - Measured on Recurring Basis - USD ($) $ in Millions	Oct. 02, 2022	Jan. 02, 2022
Assets, Fair Value Disclosure [Abstract]
Money market funds	$ 33.8	$ 96.3
Investment in Persol Holdings	0.0	264.3
Total assets at fair value	33.8	360.6
Liabilities, Fair Value Disclosure [Abstract]
Brazil indemnification	(3.3)	(2.4)
Total liabilities at fair value	(6.5)	(7.0)
Greenwood/Asher
Liabilities, Fair Value Disclosure [Abstract]
Earnout, fair value	(3.2)	(4.6)
RocketPower
Liabilities, Fair Value Disclosure [Abstract]
Earnout, fair value	0.0
Level 1
Assets, Fair Value Disclosure [Abstract]
Money market funds	33.8	96.3
Investment in Persol Holdings	0.0	264.3
Total assets at fair value	33.8	360.6
Liabilities, Fair Value Disclosure [Abstract]
Brazil indemnification	0.0	0.0
Total liabilities at fair value	0.0	0.0
Level 1 | Greenwood/Asher
Liabilities, Fair Value Disclosure [Abstract]
Earnout, fair value	0.0	0.0
Level 1 | RocketPower
Liabilities, Fair Value Disclosure [Abstract]
Earnout, fair value	0.0
Level 2
Assets, Fair Value Disclosure [Abstract]
Money market funds	0.0	0.0
Investment in Persol Holdings	0.0	0.0
Total assets at fair value	0.0	0.0
Liabilities, Fair Value Disclosure [Abstract]
Brazil indemnification	0.0	0.0
Total liabilities at fair value	0.0	0.0
Level 2 | Greenwood/Asher
Liabilities, Fair Value Disclosure [Abstract]
Earnout, fair value	0.0	0.0
Level 2 | RocketPower
Liabilities, Fair Value Disclosure [Abstract]
Earnout, fair value	0.0
Level 3
Assets, Fair Value Disclosure [Abstract]
Money market funds	0.0	0.0
Investment in Persol Holdings	0.0	0.0
Total assets at fair value	0.0	0.0
Liabilities, Fair Value Disclosure [Abstract]
Brazil indemnification	(3.3)	(2.4)
Total liabilities at fair value	(6.5)	(7.0)
Level 3 | Greenwood/Asher
Liabilities, Fair Value Disclosure [Abstract]
Earnout, fair value	(3.2)	$ (4.6)
Level 3 | RocketPower
Liabilities, Fair Value Disclosure [Abstract]
Earnout, fair value	$ 0.0