Property, Plant and Equipment, net (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Property, plant and equipment, net
Gross property, plant and equipment	$ 473.1		$ 456.8
Less: Accumulated depreciation and amortization	248.4		242.7
Net property, plant and equipment	224.7		214.1
Net capitalized turnaround costs:
Beginning balance	22.7	2.6
Additions	0.3
Depreciation	(1.6)	(1.0)
Ending balance	21.4	1.6
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	377.8		375.6
Construction in progress
Property, plant and equipment, net
Gross property, plant and equipment	$ 85.6		$ 71.5