Property, Plant and Equipment, net (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Property, plant and equipment, net
Gross property, plant and equipment	$ 434.4		$ 361.3
Less: Accumulated depreciation and amortization	235.4		233.2
Net property, plant and equipment	199.0		128.1
Net capitalized turnaround costs:
Beginning balance	2.6	6.5
Additions	18.1
Depreciation	(3.0)	(3.0)
Ending balance	17.7	3.5
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		7.6
Plant and equipment
Property, plant and equipment, net
Gross property, plant and equipment	362.0		306.4
Construction in progress
Property, plant and equipment, net
Gross property, plant and equipment	$ 62.7		$ 45.7