Property, Plant and Equipment, net (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Property, plant and equipment, net
Gross property, plant and equipment	$ 483.7		$ 456.8
Less: Accumulated depreciation and amortization	254.9		242.7
Net property, plant and equipment	228.8		214.1
Net capitalized turnaround costs:
Beginning balance	22.7	2.6
Additions	0.3
Depreciation	(3.2)	(2.0)
Ending balance	19.8	0.6
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	377.7		375.6
Construction in progress
Property, plant and equipment, net
Gross property, plant and equipment	$ 96.3		$ 71.5