Property, Plant and Equipment, net (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Property, plant and equipment, net
Gross property, plant and equipment	$ 326.5		$ 314.7
Less: Accumulated depreciation and amortization	236.1		226.9
Net property, plant and equipment	90.4		87.8
Net capitalized turnaround costs:
Beginning balance	6.5	13.4
Additions		0.3
Depreciation	(2.0)	(4.4)
Ending balance	4.5	9.3
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	7.3		7.3
Plant and equipment
Property, plant and equipment, net
Gross property, plant and equipment	305.4		302.8
Construction in progress
Property, plant and equipment, net
Gross property, plant and equipment	$ 12.2		$ 3.0

The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement.

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Gross amount of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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- Definition

Amount, net of accumulated depreciation, depletion and amortization, of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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