Other Assets and Liabilities - Other Non-Current Liabilities (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Schedule of Other Assets and Liabilities [Line Items]
Liability for unrecognized tax benefits	$ 12.9	$ 12.1
Tank Inspection Liabilities Noncurrent	9.9	9.9
Pension and other postemployment benefit liabilities, net	3.8	5.3
Long-term derivative liabilities (see Note 9)	2.8	1.4
Other	4.4	2.2
Total	$ 33.8	$ 30.9