Leases - Balance Sheet Location of Assets and Liabilities (Details) - USD ($) $ in Millions	Sep. 26, 2020	Dec. 31, 2019
Lessee, Lease, Description [Line Items]
Operating lease assets	$ 132.2	$ 129.9
Finance leases	29.2	27.6
Right-of-Use Asset	161.4	157.5
Operating lease liability, current	31.6	32.0
Finance lease liability, current	6.5	3.4
Operating lease liability, noncurrent	106.9	101.7
Finance lease liability, noncurrent	19.8	21.1
Present value of lease liabilities	164.8	158.2
Total operating lease liabilities	138.5	133.7
Total finance lease liabilities	$ 26.3	24.5
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:OtherNoncurrentAssets
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:OtherCurrentLiabilities
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:DebtCurrent
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilitiesNoncurrent
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	us-gaap:LongtermDebtNoncurrent
CSCA
Lessee, Lease, Description [Line Items]
Operating lease assets	$ 22.5	22.4
Finance leases	15.8	16.8
Total operating lease liabilities	22.8	22.8
Total finance lease liabilities	16.0	16.6
CSCI
Lessee, Lease, Description [Line Items]
Operating lease assets	32.8	41.6
Finance leases	5.7	5.8
Total operating lease liabilities	33.5	42.4
Total finance lease liabilities	2.5	2.9
RX
Lessee, Lease, Description [Line Items]
Operating lease assets	30.7	35.1
Finance leases	0.7	0.8
Total operating lease liabilities	31.9	36.3
Total finance lease liabilities	0.7	0.8
Unallocated
Lessee, Lease, Description [Line Items]
Operating lease assets	46.2	30.8
Finance leases	7.0	4.2
Total operating lease liabilities	50.3	32.2
Total finance lease liabilities	$ 7.1	$ 4.2