Business Segments (Assets and Goodwill by Segment) (Details) - USD ($) $ in Millions	Mar. 30, 2024	Dec. 30, 2023	Apr. 01, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Total assets	$ 1,853.0	$ 2,062.8	$ 2,416.7
Goodwill	426.0	427.1	466.7	$ 485.0
Active Group
Segment Reporting Information [Line Items]
Total assets	1,132.6	1,183.9	1,345.2
Goodwill	316.7	317.7	316.0
Work Group
Segment Reporting Information [Line Items]
Total assets	278.7	288.4	363.5
Goodwill	60.2	60.3	60.0
Other [Member]
Segment Reporting Information [Line Items]
Total assets	97.4	250.8	505.7
Goodwill	49.1	49.1	90.7
Corporate [Member]
Segment Reporting Information [Line Items]
Total assets	$ 344.3	$ 339.7	$ 202.3