Leases - Balance Sheet Location of Assets and Liabilities (Details) - USD ($) $ in Millions	Sep. 28, 2019	Jan. 01, 2019	Dec. 31, 2018
Lessee, Lease, Description [Line Items]
Operating lease assets	$ 131.9	$ 164.0	$ 0.0
Finance leases	27.2
Right-of-Use Asset	159.1
Present value of lease liabilities	159.6
Total operating lease liabilities	135.5	$ 166.5
Total finance lease liabilities	24.1
Operating lease assets
Lessee, Lease, Description [Line Items]
Operating lease assets	131.9
Other non-current assets
Lessee, Lease, Description [Line Items]
Finance leases	27.2
Other accrued liabilities
Lessee, Lease, Description [Line Items]
Operating lease liability, current	32.2
Current indebtedness
Lessee, Lease, Description [Line Items]
Finance lease liability, current	3.1
Other noncurrent liabilities
Lessee, Lease, Description [Line Items]
Operating lease liability, noncurrent	103.3
Long-term debt, less current portion
Lessee, Lease, Description [Line Items]
Finance lease liability, noncurrent	21.0
CSCA
Lessee, Lease, Description [Line Items]
Operating lease assets	23.1
Finance leases	17.2
Total operating lease liabilities	23.4
Total finance lease liabilities	16.9
CSCI
Lessee, Lease, Description [Line Items]
Operating lease assets	40.4
Finance leases	5.7
Total operating lease liabilities	41.2
Total finance lease liabilities	2.9
RX
Lessee, Lease, Description [Line Items]
Operating lease assets	36.4
Finance leases	0.7
Total operating lease liabilities	37.6
Total finance lease liabilities	0.7
Unallocated
Lessee, Lease, Description [Line Items]
Operating lease assets	32.0
Finance leases	3.6
Total operating lease liabilities	33.3
Total finance lease liabilities	$ 3.6