Property, Plant and Equipment, net (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Property, plant and equipment, net
Gross property, plant and equipment	$ 495.2		$ 456.8
Less: Accumulated depreciation and amortization	257.3		242.7
Net property, plant and equipment	237.9		214.1
Net capitalized turnaround costs:
Beginning balance	22.7	2.6
Additions	0.3	18.1
Depreciation	(4.7)	(3.0)
Ending balance	18.3	17.7
Land
Property, plant and equipment, net
Gross property, plant and equipment	1.6		1.6
Building and improvements
Property, plant and equipment, net
Gross property, plant and equipment	8.1		8.1
Plant and equipment
Property, plant and equipment, net
Gross property, plant and equipment	379.2		375.6
Construction in progress
Property, plant and equipment, net
Gross property, plant and equipment	$ 106.3		$ 71.5