Other Current Assets (Schedule of Other Current Assets) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]
Prepaid expenses	$ 7.5	$ 4.1
Assets held for sale	6.6
Other	1.4	0.7
Total other current assets	$ 15.5	$ 4.8