Leases (Schedule of Operating Lease Assets and Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Operating Leased Assets [Line Items]
Operating lease assets	$ 147.7	$ 144.8
Operating lease liabilities, current	39.9	35.8
Operating lease liabilities, non-current	137.7	138.7
Total lease liabilities	$ 177.6	$ 174.5
Minimum [Member]
Operating Leased Assets [Line Items]
Term of contract	1 year
Maximum [Member]
Operating Leased Assets [Line Items]
Term of contract	13 years