Commitments and Contingencies - Asbestos Damages Sought (Details) (Asbestos [Member], USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2012
Compensatory and Punitive Damages [Member] \| Range 1 [Member] \| Minimum [Member]
Loss Contingencies [Line Items]
Specified amount of damages sought	$ 0.3
Compensatory and Punitive Damages [Member] \| Range 1 [Member] \| Maximum [Member]
Loss Contingencies [Line Items]
Specified amount of damages sought	5.0
Compensatory and Punitive Damages [Member] \| Range 2 [Member] \| Minimum [Member]
Loss Contingencies [Line Items]
Specified amount of damages sought	5.0
Compensatory and Punitive Damages [Member] \| Range 2 [Member] \| Maximum [Member]
Loss Contingencies [Line Items]
Specified amount of damages sought	10.0
Compensatory and Punitive Damages [Member] \| Range 3 [Member] \| Minimum [Member]
Loss Contingencies [Line Items]
Specified amount of damages sought	10.0
Compensatory Only Damages [Member] \| Range 1 [Member] \| Minimum [Member]
Loss Contingencies [Line Items]
Specified amount of damages sought	0.1
Compensatory Only Damages [Member] \| Range 1 [Member] \| Maximum [Member]
Loss Contingencies [Line Items]
Specified amount of damages sought	0.6
Compensatory Only Damages [Member] \| Range 2 [Member] \| Minimum [Member]
Loss Contingencies [Line Items]
Specified amount of damages sought	0.6
Compensatory Only Damages [Member] \| Range 2 [Member] \| Maximum [Member]
Loss Contingencies [Line Items]
Specified amount of damages sought	5.0
Compensatory Only Damages [Member] \| Range 3 [Member] \| Minimum [Member]
Loss Contingencies [Line Items]
Specified amount of damages sought	5.0
Punitive Only Damages [Member] \| Range 1 [Member] \| Minimum [Member]
Loss Contingencies [Line Items]
Specified amount of damages sought	0
Punitive Only Damages [Member] \| Range 1 [Member] \| Maximum [Member]
Loss Contingencies [Line Items]
Specified amount of damages sought	2.5
Punitive Only Damages [Member] \| Range 2 [Member] \| Minimum [Member]
Loss Contingencies [Line Items]
Specified amount of damages sought	2.5
Punitive Only Damages [Member] \| Range 2 [Member] \| Maximum [Member]
Loss Contingencies [Line Items]
Specified amount of damages sought	5.0
Punitive Only Damages [Member] \| Range 3 [Member] \| Minimum [Member]
Loss Contingencies [Line Items]
Specified amount of damages sought	$ 5.0
Pending Litigation [Member]
Loss Contingencies [Line Items]
Number of pending claims seeking specific amounts of damages	77
Pending Litigation [Member] \| Compensatory and Punitive Damages [Member] \| Range 1 [Member]
Loss Contingencies [Line Items]
Number of pending claims seeking specific amounts of damages	54
Pending Litigation [Member] \| Compensatory and Punitive Damages [Member] \| Range 2 [Member]
Loss Contingencies [Line Items]
Number of pending claims seeking specific amounts of damages	18
Pending Litigation [Member] \| Compensatory and Punitive Damages [Member] \| Range 3 [Member]
Loss Contingencies [Line Items]
Number of pending claims seeking specific amounts of damages	5
Pending Litigation [Member] \| Compensatory Only Damages [Member] \| Range 1 [Member]
Loss Contingencies [Line Items]
Number of pending claims seeking specific amounts of damages	47
Pending Litigation [Member] \| Compensatory Only Damages [Member] \| Range 2 [Member]
Loss Contingencies [Line Items]
Number of pending claims seeking specific amounts of damages	27
Pending Litigation [Member] \| Compensatory Only Damages [Member] \| Range 3 [Member]
Loss Contingencies [Line Items]
Number of pending claims seeking specific amounts of damages	3
Pending Litigation [Member] \| Punitive Only Damages [Member] \| Range 1 [Member]
Loss Contingencies [Line Items]
Number of pending claims seeking specific amounts of damages	54
Pending Litigation [Member] \| Punitive Only Damages [Member] \| Range 2 [Member]
Loss Contingencies [Line Items]
Number of pending claims seeking specific amounts of damages	18
Pending Litigation [Member] \| Punitive Only Damages [Member] \| Range 3 [Member]
Loss Contingencies [Line Items]
Number of pending claims seeking specific amounts of damages	5

The value (monetary amount) of the award the plaintiff seeks in the legal matter.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 4

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14435-108349

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 9

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14557-108349

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6952336&loc=d3e14326-108349

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 5

-Paragraph 11

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 5

-Paragraph 9

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 5

-Paragraph 10

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 5

-Paragraph 12

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details