Leases - Balance Sheet Location of Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Lessee, Lease, Description [Line Items]
Operating lease assets	$ 129.9	$ 166.5	$ 0.0
Finance leases	27.6
Right-of-use assets	157.5
Present value of lease liabilities	158.2
Total operating lease liabilities	133.7	$ 164.0
Present value of lease liabilities	24.5
Operating lease assets
Lessee, Lease, Description [Line Items]
Operating lease assets	129.9
Other non-current assets
Lessee, Lease, Description [Line Items]
Finance leases	27.6
Other accrued liabilities
Lessee, Lease, Description [Line Items]
Operating lease liability, current	32.0
Current indebtedness
Lessee, Lease, Description [Line Items]
Finance lease liability, current	3.4
Other non-current liabilities
Lessee, Lease, Description [Line Items]
Operating lease liability, noncurrent	101.7
Long-term debt, less current portion
Lessee, Lease, Description [Line Items]
Finance lease liability, noncurrent	21.1
CSCA
Lessee, Lease, Description [Line Items]
Operating lease assets	22.4
Finance leases	16.8
Total operating lease liabilities	22.8
Present value of lease liabilities	16.6
CSCI
Lessee, Lease, Description [Line Items]
Operating lease assets	41.6
Finance leases	5.8
Total operating lease liabilities	42.4
Present value of lease liabilities	2.9
RX
Lessee, Lease, Description [Line Items]
Operating lease assets	35.1
Finance leases	0.8
Total operating lease liabilities	36.3
Present value of lease liabilities	0.8
Unallocated
Lessee, Lease, Description [Line Items]
Operating lease assets	30.8
Finance leases	4.2
Total operating lease liabilities	32.2
Present value of lease liabilities	$ 4.2