Commercial Commitments (Details) (USD $) In Millions	9 Months Ended
Sep. 30, 2011	Dec. 31, 2010
Commercial Commitments
Total guarantees	$ 132.4	$ 130.7
Standby letters of credit and bonds	10.9	11.5
Total commercial commitments	143.3	142.2
Commercial Commitments (Textual) [Abstract]
Amount of liability included in recorded value of the company's guarantee	6.6	7.3
Expiration of guarantees, range	2011 to 2019
Affiliate Guarantees [Member]
Commercial Commitments
Total guarantees	50.0	30.0
Asset residual value guarantees [Member]
Commercial Commitments
Total guarantees	34.1	48.0
Lease payment guarantees [Member]
Commercial Commitments
Total guarantees	$ 48.3	$ 52.7

The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees.

Reference 1: 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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name FASB Interpretation (FIN)

-Number 45

-Paragraph 13

-Subparagraph c

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 4

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248

Name:	us-gaap_GuaranteeObligationsCurrentCarryingValue
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant