Business Segments (Revenue and Operating Profit by Segment) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 28, 2024	Sep. 30, 2023	Sep. 28, 2024	Sep. 30, 2023
Segment Reporting Information [Line Items]
Revenue	$ 440.2	$ 527.7	$ 1,260.3	$ 1,716.2
Operating profit (loss)	35.2	27.3	61.2	118.7
Interest expense, net	9.6	15.5	33.5	47.4
Other Nonoperating Income (Expense)	(3.8)	2.4	(5.4)	3.2
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest	29.4	9.4	33.1	68.1
Active Group
Segment Reporting Information [Line Items]
Revenue	318.7	328.6	914.4	1,097.8
Operating profit (loss)	53.3	32.7	131.6	124.6
Work Group
Segment Reporting Information [Line Items]
Revenue	109.1	123.0	304.2	355.3
Operating profit (loss)	16.3	15.4	43.6	45.7
Other [Member]
Segment Reporting Information [Line Items]
Revenue	12.4	76.1	41.7	263.1
Operating profit (loss)	8.3	8.2	20.7	27.9
Corporate [Member]
Segment Reporting Information [Line Items]
Operating profit (loss)	$ (42.7)	$ (29.0)	$ (134.7)	$ (79.5)

Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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