Other Assets and Liabilities Other Non-Current Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Other Non-Current Liabilities [Line Items]
Liability for unrecognized tax benefits	$ 19.2	$ 6.1	$ 1.7	$ 0.2
Total	62.9	83.0
Other Noncurrent Liabilities
Other Non-Current Liabilities [Line Items]
Pension and other postemployment benefit liabilities, net	17.6	37.0
Long-term derivative liabilities	1.0	0.9
Liability for unrecognized tax benefits	19.2	6.1
Above-market leases	9.2	11.2
Tank inspection liabilities	9.9	11.7
Other	6.0	16.1
Total	$ 62.9	$ 83.0