XML 120 R82.htm IDEA: XBRL DOCUMENT v2.4.0.6
Pension and Postretirement Health and Life Obligation and Funded Status (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Change in Plan Assets [Roll Forward]      
Non-Current Liabilities $ 253.5 $ 231.4  
Pension [Member]
      
Defined Benefit Plan Disclosure [Line Items]      
Accumulated Benefit Obligation 550.6 485.6  
Change in Benefit Obligation [Roll Forward]      
Obligation, Beginning of Year 525.6 465.2  
Service Cost 7.6 6.2 5.7
Interest Cost 27.4 26.2 26.2
Actuarial Loss (Gain) 54.6 47.1  
Benefits Paid (28.6) (27.2)  
Participant Contributions 10.9 8.1  
Obligation, End of Year 597.5 525.6 465.2
Change in Plan Assets [Roll Forward]      
Fair Value, Beginning of Year 382.0 327.6  
Actual Return on Plan Assets 33.1 45.6  
Employer Contribution 45.8 36.0  
Benefits Paid (28.5) (27.2)  
Fair Value, End of Year 432.4 382.0 327.6
Funded Status, End of Year (165.1) (143.6)  
Current Liabilities (1.1) (0.8)  
Non-Current Liabilities (164.0) (142.8)  
Postretirement Health and Life [Member]
      
Change in Benefit Obligation [Roll Forward]      
Obligation, Beginning of Year 204.1 192.1  
Service Cost 3.8 4.8 4.1
Interest Cost 10.8 10.9 10.0
Actuarial Loss (Gain) (2.9) 17.6  
Benefits Paid (7.7) (9.2)  
Participant Contributions 2.5 2.1  
Plan Amendments 0 (14.2)  
Obligation, End of Year 210.6 204.1 192.1
Change in Plan Assets [Roll Forward]      
Fair Value, Beginning of Year 114.7 96.4  
Actual Return on Plan Assets 0 12.0  
Employer Contribution 11.4 13.4  
Participant Contributions 2.5 2.0  
Benefits Paid (7.6) (9.1)  
Fair Value, End of Year 121.0 114.7 96.4
Funded Status, End of Year (89.6) (89.4)  
Current Liabilities (0.9) (0.8)  
Non-Current Liabilities (88.7) (88.6)  
Grantor Trust [Member]
      
Change in Plan Assets [Roll Forward]      
Other Investments $ 20.3 $ 19.8