Business Segments (Revenue and Operating Profit by Segment) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Oct. 01, 2022	Sep. 30, 2023	Oct. 01, 2022
Segment Reporting Information [Line Items]
Revenue	$ 527.7	$ 691.4	$ 1,716.2	$ 2,019.8
Operating profit (loss)	27.3	58.8	118.7	246.3
Interest expense, net	15.5	12.5	47.4	31.3
Other Nonoperating Income (Expense)	2.4	2.7	3.2	2.2
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	9.4	43.6	68.1	212.8
Active Group
Segment Reporting Information [Line Items]
Revenue	328.6	398.2	1,097.8	1,172.6
Operating profit (loss)	32.7	54.9	124.6	180.8
Work Group
Segment Reporting Information [Line Items]
Revenue	123.0	157.8	355.3	435.8
Operating profit (loss)	15.4	28.2	45.7	81.7
Lifestyle Group
Segment Reporting Information [Line Items]
Revenue	62.8	117.7	223.0	346.9
Operating profit (loss)	5.4	13.4	18.6	43.2
Other [Member]
Segment Reporting Information [Line Items]
Revenue	13.3	17.7	40.1	64.5
Operating profit (loss)	2.8	2.8	9.3	9.7
Corporate [Member]
Segment Reporting Information [Line Items]
Operating profit (loss)	$ (29.0)	$ (40.5)	$ (79.5)	$ (69.1)