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Environmental Obligations (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
part_per_million
properties
Sep. 30, 2011
Sep. 30, 2012
part_per_million
properties
Sep. 30, 2011
Dec. 31, 2011
Enviromental Liability Reconciliation [Line Items]          
Tribal Permit Fee     $ 1.5    
Accrual for Environmental Loss Contingencies, Increase (Decrease) for Revision in Estimates 4.9 [1] 5.0 [1] 19.4 [1] 35.1 [1]  
Environmental provision, net applicable to continuing operations 1.0 [2] 1.1 [2] 3.5 [2] 4.1 [2]  
Environmental reserves, excluding recoveries 238.4   238.4   251.2
Expected recoveries recorded 66.9   66.9   82.6
Increase in Third-party Environmental Recoveries Receivable     0    
Cash recoveries recorded     15.7    
Environmental loss contingencies, net of expected recoveries, in excess of accrual     160    
Accrual for Environmental Loss Contingencies [Roll Forward]          
Total environmental reserves, net of recoveries at begining of period     226.9    
Provision     19.4    
Spending, net of recoveries     (26.2)    
Net change     (6.8)    
Total environmental reserves, net of recoveries at end of period 220.1   220.1    
Environmental reserves, current, net of recoveries (1) 24.2 [3]   24.2 [3]    
Environmental reserves, long-term continuing and discontinued, net of recoveries 195.9 [4]   195.9 [4]   213.3
Total environmental reserves, net of recoveries at end of period 220.1   220.1    
Environmental Provision, Net of Recoveries recorded to Other Assets 4.9 4.7 19.4 23.8  
Environmental Cost Recognized, Recovery Credited to Expense 0 [5] (0.3) [5] 0 [5] (11.3) [5]  
Environmental Loss Exposure in Excess of Accrual Increase, Best Estimate     50    
Tribal Court Decision on Permit Fees 9.0        
Residental Properties 150   150    
Clean up standard parts per million 20   20    
Properties 180   180    
Middleport [Member]
          
Accrual for Environmental Loss Contingencies [Roll Forward]          
Total environmental reserves, net of recoveries at begining of period         47.0
Total environmental reserves, net of recoveries at end of period 50.3   50.3   47.0
Total environmental reserves, net of recoveries at end of period 50.3   50.3   47.0
Environmental Liabilities, Continuing and Discontinued [Member]
          
Enviromental Liability Reconciliation [Line Items]          
Expected recoveries recorded 18.3   18.3   24.3
Increase in Third-party Environmental Recoveries Receivable     0    
Cash recoveries recorded     6.0    
Other Assets [Member]
          
Enviromental Liability Reconciliation [Line Items]          
Expected recoveries recorded 48.6   48.6   58.3
Increase in Third-party Environmental Recoveries Receivable     0    
Cash recoveries recorded     9.7    
Environmental Remediation Expense [Member]
          
Accrual for Environmental Loss Contingencies [Roll Forward]          
Discontinued Operation, provision for environmental and legal, before tax $ 3.9 [6] $ 3.6 [6] $ 15.9 [6] $ 19.7 [6]  
[1] See above roll forward of our total environmental reserves as presented on our condensed consolidated balance sheets.
[2] Recorded as a component of “Restructuring and other charges (income)” on our condensed consolidated statements of income. See Note 8.
[3] “Current” includes only those reserves related to continuing operations. These amounts are included within "Accrued and other liabilities" on the condensed consolidated balance sheets.
[4] These amounts are included in “Environmental liabilities, continuing and discontinued” on the condensed consolidated balance sheets.
[5] Represents certain environmental recoveries.
[6] Recorded as a component of “Discontinued operations, net of income taxes" on our consolidated statements of income. See Note 10.