Related Party Transactions (Details) - USD ($) shares in Millions, $ in Millions		3 Months Ended		9 Months Ended
	Sep. 20, 2019	Sep. 27, 2019	Sep. 28, 2018	Sep. 27, 2019	Sep. 28, 2018	Jan. 01, 2019	Dec. 31, 2018
Related Party Transaction [Line Items]
Payments to Acquire Businesses				$ 2,000.0
Common stock, shares issued (in shares)	127.9
Operating lease ROU assets		$ 201.8		201.8		$ 182.0
Operating lease liability		213.8		213.8		$ 191.0
Lease liabilities, current		27.1		27.1			$ 0.0
Lease liabilities, noncurrent		186.7		186.7			$ 0.0
Danaher
Related Party Transaction [Line Items]
Payments to Acquire Businesses	$ 2,000.0
Common stock, shares issued (in shares)	127.9
Related party expenses		19.1	$ 22.0	62.1	$ 66.2
Fees incurred by Danaher in relation to the initial public offering	$ 7.0
Danaher | General and Administrative Expense
Related Party Transaction [Line Items]
Related party expenses		7.2	7.8	23.2	23.1
Danaher | Insurance Program Expenses
Related Party Transaction [Line Items]
Related party expenses		0.8	1.0	2.7	2.9
Danaher | Medical Insurance Programs Expense
Related Party Transaction [Line Items]
Related party expenses		11.0	13.0	35.5	39.4
Danaher | Deferred Compensation Program Expenses
Related Party Transaction [Line Items]
Related party expenses		0.1	$ 0.2	0.7	$ 0.8
Danaher [Member]
Related Party Transaction [Line Items]
Operating lease ROU assets		25.0		25.0
Operating lease liability		26.0		26.0
Lease liabilities, current		3.0		3.0
Lease liabilities, noncurrent		$ 23.0		$ 23.0