Revenue From Contracts With Customers Disaggregated Revenue (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Jan. 01, 2022	Jan. 02, 2021
Revenue	$ 2,684.8	$ 2,414.9	$ 1,791.1
Active Group
Revenue	1,570.2	1,319.6	909.3
Active Group | Sales Channel, Through Intermediary [Member]
Revenue	1,086.6	930.7	682.9
Active Group | Sales Channel, Directly to Consumer [Member]
Revenue	483.6	388.9	226.4
Work Group
Revenue	590.5	548.8	425.4
Work Group | Sales Channel, Through Intermediary [Member]
Revenue	532.0	487.3	372.0
Work Group | Sales Channel, Directly to Consumer [Member]
Revenue	58.5	61.5	53.4
Lifestyle Group
Revenue	447.5	477.0	407.0
Lifestyle Group | Sales Channel, Through Intermediary [Member]
Revenue	304.0	305.6	263.4
Lifestyle Group | Sales Channel, Directly to Consumer [Member]
Revenue	143.5	171.4	143.6
Other Segments [Member]
Revenue	76.6	69.5	49.4
Other Segments [Member] | Sales Channel, Through Intermediary [Member]
Revenue	70.4	63.6	45.3
Other Segments [Member] | Sales Channel, Directly to Consumer [Member]
Revenue	$ 6.2	$ 5.9	$ 4.1