Property, Plant and Equipment, Net (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Property, plant and equipment, net
Gross property, plant and equipment	$ 456.8	$ 361.3
Less: Accumulated depreciation and amortization	242.7	233.2
Net property, plant and equipment	214.1	128.1
Net capitalized turnaround costs:
Beginning balance	2.6	6.5
Additions	24.7
Depreciation	(4.6)	(3.9)
Ending balance	22.7	2.6
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	7.6
Plant and equipment
Property, plant and equipment, net
Gross property, plant and equipment	375.6	306.4
Construction in progress
Property, plant and equipment, net
Gross property, plant and equipment	$ 71.5	$ 45.7