Basis of Presentation and Principles of Consolidation - Concentration of Credit Risks (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Concentration Risk [Line Items]
Excess tax benefits from share-based award payments which were recognized under ASU 2016-09	$ 0.0	$ 0.0	$ 1.5	$ 0.0
Net sales | Customer Concentration Risk | Murphy USA
Concentration Risk [Line Items]
Major customer percentage of net sales	11.40%		12.30%
Net sales | Customer Concentration Risk | Murphy USA and Alimentation Couche-Tard
Concentration Risk [Line Items]
Major customer percentage of net sales		23.00%		23.00%
Accounting Standards Update 2016-09
Concentration Risk [Line Items]
Excess tax benefits from share-based award payments which were recognized under ASU 2016-09			$ 1.5
Accounting Standards Update 2015-17
Concentration Risk [Line Items]
Current deferred income tax assets					$ (4.7)
Current deferred income tax liabilities					(0.1)
Non-current deferred income tax liabilities					4.7
Net non-current deferred income tax assets					$ 0.1