Other Income (Expense), Net and Gain on Sale of Product Lines (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended			9 Months Ended		12 Months Ended
	Apr. 30, 2020	Oct. 02, 2020	Jul. 03, 2020	Sep. 27, 2019	Oct. 02, 2020	Sep. 27, 2019	Dec. 31, 2019
Other Income and Expenses [Abstract]
Other nonoperating income, net pension and postretirement benefits		$ 3.0		$ 4.0	$ 14.0	$ 14.0
Unrealized gain (loss) on investments		3.0			(10.0)
Disposal group, product lines, revenues							$ 170.0
Proceeds from sale of product lines	$ 826.0				825.9	0.0
Pretax gain on sale of product lines		$ 0.0	$ 455.0	$ 0.0	$ 454.6	$ 0.0
Gain on sale of product lines, net of tax			$ 305.0
Gain on sale of product lines, net of tax, per diluted common share			$ 0.42