Leases Supplemental Balance Sheet Information Related to Leases (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Right-of-use operating lease assets	$ 143.3	$ 167.5
Finance Lease, Right-of-Use Asset	5.2	2.4
Total leased assets	148.5	169.9
Operating lease liabilities	55.7	62.8
Finance Lease, Liability, Current	1.9	0.9
Long-term operating lease liabilities	93.1	106.4
Finance Lease, Liability, Noncurrent	3.0	1.4
Total lease liabilities	$ 153.7	$ 171.5