Business Segments (Assets and Goodwill by Segment) (Details) - USD ($) $ in Millions	Jun. 29, 2024	Dec. 30, 2023	Jul. 01, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Total assets	$ 1,796.3	$ 2,062.8	$ 2,357.3
Goodwill	425.8	427.1	469.7	$ 485.0
Active Group
Segment Reporting Information [Line Items]
Total assets	1,072.7	1,183.9	1,315.3
Goodwill	316.5	317.7	317.4
Work Group
Segment Reporting Information [Line Items]
Total assets	282.8	288.4	319.4
Goodwill	60.2	60.3	60.3
Other [Member]
Segment Reporting Information [Line Items]
Total assets	98.5	250.8	471.2
Goodwill	49.1	49.1	92.0
Corporate [Member]
Segment Reporting Information [Line Items]
Total assets	$ 342.3	$ 339.7	$ 251.4