Business Segments (Assets and Goodwill by Segment) (Details) - USD ($) $ in Millions	Sep. 28, 2024	Dec. 30, 2023	Sep. 30, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Total assets	$ 1,758.7	$ 2,062.8	$ 2,231.3
Goodwill	430.5	427.1	465.4	$ 485.0
Active Group
Segment Reporting Information [Line Items]
Total assets	1,106.7	1,183.9	1,270.0
Goodwill	320.4	317.7	314.9
Work Group
Segment Reporting Information [Line Items]
Total assets	290.5	288.4	322.4
Goodwill	61.0	60.3	59.8
Other [Member]
Segment Reporting Information [Line Items]
Total assets	85.4	250.8	401.0
Goodwill	49.1	49.1	90.7
Corporate [Member]
Segment Reporting Information [Line Items]
Total assets	$ 276.1	$ 339.7	$ 237.9