Discontinued Operations - Key Components of Income and Major Classes of Assets and Liabilities from Discontinued Operations (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 27, 2019	Sep. 28, 2018	Sep. 27, 2019	Sep. 28, 2018	Dec. 31, 2018
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]
Sales	$ 0.0	$ 238.9	$ 6.1	$ 741.6
Cost of sales	(0.1)	(140.5)	(6.2)	(430.6)
Selling, general and administrative expenses	0.0	(49.8)	(0.5)	(125.9)
Research and development expenses	0.0	(8.7)	0.0	(27.0)
Gain (loss) on disposition of discontinued operations before income taxes	(0.6)	0.0	(0.4)	0.0
Interest expense and other income, net	0.5	(1.3)	0.5	(4.0)
Earnings before income taxes	(0.2)	38.6	(0.5)	154.1
Income taxes	0.0	(7.3)	0.0	(30.8)
Net earnings from discontinued operations	(0.2)	$ 31.3	(0.5)	$ 123.3
ASSETS
Accounts receivable, net	0.1		0.1		$ 4.2
Inventories	0.0		0.0		4.4
Prepaid expenses and other current assets	17.7		17.7		21.4
Total current assets, discontinued operations	17.8		17.8		30.0
Current liabilities:
Trade accounts payable	5.3		5.3		9.2
Accrued expenses and other current liabilities	10.4		10.4		21.5
Total current liabilities, discontinued operations	$ 15.7		$ 15.7		$ 30.7