Leases - Balance Sheet Location of Assets and Liabilities (Details) - USD ($) $ in Millions	Mar. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Lessee, Lease, Description [Line Items]
Operating lease assets	$ 146.8	$ 164.0	$ 0.0
Finance leases	9.9
Right-of-Use Asset	156.7
Present value of lease liabilities	157.8
Total operating lease liabilities	151.2	$ 166.5
Total finance lease liabilities	6.6
Operating lease assets
Lessee, Lease, Description [Line Items]
Operating lease assets	146.8
Other non-current assets
Lessee, Lease, Description [Line Items]
Finance leases	9.9
Accrued liabilities
Lessee, Lease, Description [Line Items]
Operating lease liability, current	34.8
Current indebtedness
Lessee, Lease, Description [Line Items]
Finance lease liability, current	1.9
Other noncurrent liabilities
Lessee, Lease, Description [Line Items]
Operating lease liability, noncurrent	116.4
Long-term debt, less current portion
Lessee, Lease, Description [Line Items]
Finance lease liability, noncurrent	4.7
CSCA
Lessee, Lease, Description [Line Items]
Operating lease assets	30.1
Finance leases	1.9
Total operating lease liabilities	30.2
Total finance lease liabilities	1.4
CSCI
Lessee, Lease, Description [Line Items]
Operating lease assets	43.5
Finance leases	6.1
Total operating lease liabilities	44.4
Total finance lease liabilities	3.3
RX
Lessee, Lease, Description [Line Items]
Operating lease assets	38.6
Finance leases	0.1
Total operating lease liabilities	40.1
Total finance lease liabilities	0.1
Unallocated
Lessee, Lease, Description [Line Items]
Operating lease assets	34.6
Finance leases	1.8
Total operating lease liabilities	36.5
Total finance lease liabilities	$ 1.8