Discontinued Operations and Assets Held for Sale Components Reflected in Discontinued Operations (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss on sale of California Discontinued Entities	$ 13.3	$ 0.0	$ 0.0
Retail Entities | Discontinued Operations, Held-for-sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net revenues			1,216.3
Cost of materials and other			(1,041.2)
Operating expenses			(116.4)
General and administrative expenses			(21.8)
Depreciation and amortization			(20.4)
Interest expense			(6.4)
Gain on sale of Retail Entities			134.1
Income (loss) from discontinued operations before taxes			144.2
Income tax expense (benefit)			57.9
Income (loss) from discontinued operations, net of tax			$ 86.3
California Discontinued Entities | Discontinued Operations, Held-for-sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net revenues	32.5	82.4
Cost of materials and other	3.8	(68.7)
Operating expenses	(9.4)	(14.4)
Total cost of sales	(5.6)	(83.1)
General and administrative expenses	(1.1)	(6.0)
Other operating income, net	0.3	(0.2)
Interest expense	0.0	(1.7)
Interest income	3.0	0.0
Other expense, net	0.0	0.0
Loss on sale of California Discontinued Entities	(40.0)	0.0
Income (loss) from discontinued operations before taxes	(10.9)	(8.6)
Income tax expense (benefit)	(2.2)	(2.7)
Income (loss) from discontinued operations, net of tax	$ (8.7)	$ (5.9)