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Organization and Basis of Presentation Revenue Recognition (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 120 Months Ended 12 Months Ended 24 Months Ended 45 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2011
2009 GM Agreement [Member]
Dec. 31, 2010
2009 GM Agreement [Member]
Dec. 31, 2009
2009 GM Agreement [Member]
Sep. 30, 2019
2009 GM Agreement [Member]
Sep. 30, 2009
2009 GM Agreement [Member]
Dec. 31, 2011
2008 GM Agreement [Member]
Dec. 31, 2010
2008 GM Agreement [Member]
Dec. 31, 2009
2008 GM Agreement [Member]
Dec. 31, 2008
2008 GM Agreement [Member]
Dec. 31, 2009
2008 GM Agreement [Member]
Feb. 28, 2012
2008 GM Agreement [Member]
Dec. 31, 2011
Miscellaneous Deferred Revenue [Member]
Dec. 31, 2010
Miscellaneous Deferred Revenue [Member]
Dec. 31, 2009
Miscellaneous Deferred Revenue [Member]
Deferred Revenue Arrangement [Line Items]                                
2009 GM Agreement, Cash Received             $ 110.0                  
2009 GM Agreement, Deferred Revenue Recognized             79.7                  
Deferred revenue     61.4                          
Deferred revenue 32.9 79.9 8.0         9.5                
Deferred revenue 88.2 116.0 53.4                          
Deferred Revenue, Revenue Recognized     8.0 8.0 2.3     57.0 57.0 57.0       15.6 12.5 11.1
2008 GM Agreement, Cash Received in 2008                     115.0          
2008 GM Agreement, Cash Received in 2009                   60.0            
2008 GM Agreement, Total Deferred Revenue Recognized                       213.7        
2008 GM Agreement, Fair Value of Liability Assumed by GM for Postretirement Cost Sharing                       $ 38.7        
2008 GM Agreement, Amortization Period of Deferred Revenue                         45 months      
2009 GM Agreement, Amortization Period of Deferred Revenue           120 months