Business Segments (Assets and Goodwill by Segment) (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022	Oct. 01, 2022	Jan. 01, 2022
Segment Reporting Information [Line Items]
Total assets	$ 2,231.3	$ 2,492.7	$ 3,170.6
Goodwill	465.4	485.0	526.5	$ 556.6
Active Group
Segment Reporting Information [Line Items]
Total assets	1,270.0	1,331.5	1,697.4
Goodwill	314.9	314.4	358.0
Work Group
Segment Reporting Information [Line Items]
Total assets	322.4	375.7	452.0
Goodwill	59.8	59.6	58.7
Lifestyle Group
Segment Reporting Information [Line Items]
Total assets	336.5	514.8	760.9
Goodwill	77.1	97.4	96.2
Other [Member]
Segment Reporting Information [Line Items]
Total assets	64.5	58.6	67.0
Goodwill	13.6	13.6	13.6
Corporate [Member]
Segment Reporting Information [Line Items]
Total assets	$ 237.9	$ 212.1	$ 193.3