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Pension and Postretirement Plans (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]      
Defined Contribution Plan, Cost Recognized $ 6.9 $ 6.4 $ 4.8
Fair value of plan assets 355.5 324.6  
Capitalized portion of defined benefit contribution percent 11.00% 7.00% 8.00%
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]      
Pension and postretirement benefit obligations (noncurrent liablity) 362.7 389.9  
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Allocation Percentage in US based Investments 75.00%    
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]      
Curtailment loss 0 4.2 0
Disclosure of Expected Gross Prescription Drug Subsidy Receipts [Abstract]      
2013 0.7    
2014 0.7    
2015 0.7    
2016 0.6    
2017 0.6    
Years 2018 - 2022 2.2    
Pension Plans, Defined Benefit [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Tax Effect 0.2 0.2  
Fair value of plan assets 343.8 312.5 324.0
Pension and Other Postretirement Benefit Contributions [Abstract]      
Employer contributions 25.9 20.1  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, Sales, Issuances, Settlements [Abstract]      
Balance, beginning of the year 25.5 21.1  
Realized gains, net 1.0 1.7  
Unrealized gains, net 1.8 3.1  
Purchases, sales, issuances, settlements (0.5) (0.4)  
Balance, end of the year 27.8 25.5 21.1
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]      
Discount rate 3.30% 3.90%  
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets 7.75% 7.75%  
Future compensation growth rate 3.00% 3.00%  
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]      
Accrued payroll and benefits (current liability) 1.7 1.7  
Pension and postretirement benefit obligations (noncurrent liablity) 239.4 255.0  
Total 241.1 256.7  
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]      
Service cost 2.6 5.1 5.2
Interest cost on projected benefit obligation 21.3 24.8 26.8
Expected Return on Plan Assets (26.1) (29.3) (30.3)
Amortization of: Prior service cost (benefit) 0.1 0.3 0.5
Amortization of: Actuarial loss 19.4 14.3 9.3
Curtailment loss 0 4.2 0
Benefit costs 17.3 19.4 11.5
Defined Benefit Plan, Estimated Future Benefit Payments [Abstract]      
2013 40.0    
2014 41.7    
2015 40.8    
2016 41.6    
2017 41.6    
Years 2018-2022 195.2    
Disclosure of Expected Gross Prescription Drug Subsidy Receipts [Abstract]      
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Gains (Losses), Tax Effect 109.0 111.6  
Other Postretirement Benefit Plans, Defined Benefit [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Tax Effect (26.0) (30.8)  
Fair value of plan assets 11.7 12.1 12.3
Pension and Other Postretirement Benefit Contributions [Abstract]      
Employer contributions 24.7 24.1  
Estimated Future Employer Contributions in Next Fiscal Year 20.5    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases, Sales, Issuances, Settlements [Abstract]      
Balance, beginning of the year 12.1 12.3  
Realized gains, net 0.4 0.3  
Unrealized gains, net 0 0  
Purchases, sales, issuances, settlements (0.8) (0.5)  
Balance, end of the year 11.7 12.1 12.3
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]      
Discount rate 3.10% 3.60%  
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets 0.00% 0.00%  
Future compensation growth rate 0.00% 0.00%  
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]      
Accrued payroll and benefits (current liability) 21.4 21.5  
Pension and postretirement benefit obligations (noncurrent liablity) 119.3 131.3  
Total 140.7 152.8  
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]      
Service cost 0.5 0.3 0.2
Interest cost on projected benefit obligation 5.6 7.1 8.0
Expected Return on Plan Assets 0 0 0
Amortization of: Prior service cost (benefit) (13.2) (13.2) (13.1)
Amortization of: Actuarial loss 6.8 6.5 5.2
Curtailment loss 0 0 0
Benefit costs (0.3) 0.7 0.3
Defined Benefit Plan, Estimated Future Benefit Payments [Abstract]      
2013 21.2    
2014 17.5    
2015 16.3    
2016 14.9    
2017 13.6    
Years 2018-2022 45.6    
Disclosure of Expected Gross Prescription Drug Subsidy Receipts [Abstract]      
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Gains (Losses), Tax Effect 35.6 37.3  
pension plan qualified [Member]
     
Pension and Other Postretirement Benefit Contributions [Abstract]      
Estimated Future Employer Contributions in Next Fiscal Year 41.6    
Pension benefit contributions 23.9 18.1 5.6
Pension Plan Non-Qualified [Member]
     
Pension and Other Postretirement Benefit Contributions [Abstract]      
Estimated Future Employer Contributions in Next Fiscal Year 2.0    
Pension benefit contributions 2.0 2.0 2.1
Equity Securities [Member]
     
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Target allocation percentage of assets, equity securities 61.00%    
Equity Funds [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 163.3 150.6  
Equity Index Funds International [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 49.8 44.2  
Fixed Income Funds [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 102.9 91.9  
Money Market Funds [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   0.3  
Real Estate Funds [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 27.8 25.5  
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Target allocation percentage of assets, equity securities 6.00%    
Insurance Contract, Rights and Obligations [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 11.7 12.1  
Fixed Income Securities [Member]
     
Defined Benefit Plan, Assets, Target Allocations [Abstract]      
Target allocation percentage of assets, equity securities 33.00%    
Fair Value, Inputs, Level 1 [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 316.0 286.7  
Fair Value, Inputs, Level 1 [Member] | Equity Funds [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 163.3 150.6  
Fair Value, Inputs, Level 1 [Member] | Equity Index Funds International [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 49.8 44.2  
Fair Value, Inputs, Level 1 [Member] | Fixed Income Funds [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 102.9 91.9  
Fair Value, Inputs, Level 1 [Member] | Money Market Funds [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   0  
Fair Value, Inputs, Level 1 [Member] | Real Estate Funds [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Fair Value, Inputs, Level 1 [Member] | Insurance Contract, Rights and Obligations [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Fair Value, Inputs, Level 2 [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0.3  
Fair Value, Inputs, Level 2 [Member] | Equity Funds [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Fair Value, Inputs, Level 2 [Member] | Equity Index Funds International [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Fair Value, Inputs, Level 2 [Member] | Fixed Income Funds [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Fair Value, Inputs, Level 2 [Member] | Money Market Funds [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   0.3  
Fair Value, Inputs, Level 2 [Member] | Real Estate Funds [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Fair Value, Inputs, Level 2 [Member] | Insurance Contract, Rights and Obligations [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Fair Value, Inputs, Level 3 [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 39.5 37.6  
Fair Value, Inputs, Level 3 [Member] | Equity Funds [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Fair Value, Inputs, Level 3 [Member] | Equity Index Funds International [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Fair Value, Inputs, Level 3 [Member] | Fixed Income Funds [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0 0  
Fair Value, Inputs, Level 3 [Member] | Money Market Funds [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets   0  
Fair Value, Inputs, Level 3 [Member] | Real Estate Funds [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 27.8 25.5  
Fair Value, Inputs, Level 3 [Member] | Insurance Contract, Rights and Obligations [Member]
     
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 11.7 $ 12.1