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Environmental Obligations (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Enviromental Liability Rollforward [Line Items]      
Environmental reserves, excluding recoveries $ 230.8   $ 236.5
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 216.0    
Provision 5.3 [1] 5.1 [1]  
Spending, net of recoveries (11.5)    
Net change (6.2)    
Total environmental reserves, net of recoveries at end of period 209.8    
Environmental reserves, current, net of recoveries (1) 21.7 [2]    
Environmental reserves, long-term continuing and discontinued, net of recoveries 188.1 [3]   200.2
Expected recoveries recorded 70.8   72.1
Increase in Third-party Environmental Recoveries Receivable 1.5    
Cash recoveries recorded (2.8)    
Total environmental reserves, net of recoveries at end of period 209.8    
Environmental Charges, Net 4.3 5.1  
Environmental Cost Recognized, Recovery Credited to Expense (1.0) [4] 0 [4]  
Environmental Provision, Net of Recoveries recorded to Other Assets 4.3 5.1  
Environmental Liabilities, Continuing and Discontinued [Member]
      
Accrual for Environmental Loss Contingencies [Roll Forward]      
Expected recoveries recorded 21.0   20.5
Increase in Third-party Environmental Recoveries Receivable 0.5    
Cash recoveries recorded 0    
Other Assets [Member]
      
Accrual for Environmental Loss Contingencies [Roll Forward]      
Expected recoveries recorded 49.8   51.6
Increase in Third-party Environmental Recoveries Receivable 1.0    
Cash recoveries recorded (2.8)    
Segment, Continuing Operations [Member]
      
Accrual for Environmental Loss Contingencies [Roll Forward]      
Environmental Charges, Net 1.0 [5] 1.0 [5]  
Segment, Discontinued Operations [Member] | Environmental Remediation Expense [Member]
      
Accrual for Environmental Loss Contingencies [Roll Forward]      
Environmental Charges, Net $ 3.3 [6] $ 4.1 [6]  
[1] See above roll forward of our total environmental reserves as presented on our condensed consolidated balance sheets.
[2] “Current” includes only those reserves related to continuing operations. These amounts are included within "Accrued and other liabilities" on the condensed consolidated balance sheets.
[3] These amounts are included in “Environmental liabilities, continuing and discontinued” on the condensed consolidated balance sheets.
[4] Represents certain environmental recoveries.
[5] Recorded as a component of “Restructuring and other charges (income)” on our condensed consolidated statements of income. See Note 7.
[6] Recorded as a component of “Discontinued operations, net of income taxes" on our consolidated statements of income. See Note 10.