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Reclassifications out of Accumulated Other Comprehensive Income (Loss) - Changes in Accumulated Other Comprehensive Income (Loss) by Component (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Accumulated Other Comprehensive Loss [Roll Forward]    
Beginning Accumulated Other Comprehensive Loss, Unrealized Gains and Losses on Available-for-sale Securities $ (0.1) [1]  
Beginning Accumulated Other Comprehensive Loss, Defined Benefit Pension and Other Postretirement Items (21.5) [1]  
Beginning Accumulated Other Comprehensive Loss, Gains and Losses on Cash Flow Hedge (0.4) [1]  
Beginning Accumulated Other Comprehensive Loss, Total (22.0) [1]  
Other Comprehensive Income (Loss) before Reclassifications [Abstract]    
Other Comprehensive Income (Loss) Before Reclassifications, Unrealized Gains and Losses on Available-for-sale Securities 0.5 [1]  
Other Comprehensive Income (Loss) Before Reclassifications, Defined Benefit Pension and Other Postretirement Items (2.9) [1]  
Other Comprehensive Income (Loss) Before Reclassifications, Gains and Losses on Cash Flow Hedge 0.1 [1]  
Other Comprehensive Income (Loss) Before Recalssifications, Total (2.3) [1]  
Available-for-sale Securities [Abstract]    
Amounts Reclassified From Accumulated Other Comprehensive Loss, Unrealized Gains and Losses on Available-for-sale Securities 0.5 [1]  
Pension and Other Postretirement Benefit Plans [Abstract]    
Amounts Reclassified From Accumulated Other Comprehensive Loss, Defined Benefit Pension and Other Postretirement Items (3.2) [1],[2]  
Amounts Reclassified From Accumulated Other Comprehensive Loss, Defined Benefit Pension and Other Postretirement Items, Before Tax (5.2) [2]  
Amounts Reclassified From Accumulated Other Comprehensive Loss, Amortization of Defined Benefit Pension and Other Postretirement Items, Prior Service Costs, Before Tax 0.5 [3]  
Amounts Reclassified From Accumulated Other Comprehensive Loss, Amortization of Defined Benefit Pension and Other Postretirement Items, Actuarial Gains and Losses, Before Tax (5.7) [2],[3]  
Amounts Reclassified From Accumulated Other Comprehensive Loss, Gains and Losses on Cash Flow Hedge 0 [1],[4]  
Amounts Reclassified From Accumulated Other Comprehensive Loss, Total Reclassifications (2.7) [1],[2]  
Net Other Comprehensive Income (Loss) [Abstract]    
Net Other Comprehensive Income, Unrealized Gains and Losses on Available-for-sale Securities 0 [1] 1.0
Net Other Comprehensive Income, Defined Benefit Pension and Other Postretirement Items 0.3 [1] 0.5
Net Other Comprehensive Income, Gains and Losses on Cash Flow Hedge 0.1 [1] (0.1)
Net Other Comprehensive Income, Total 0.4 [1] 1.4
Ending Accumulated Other Comprehensive Loss, Unrealized Gains and Losses on Available-for-sale Securities (0.1) [1]  
Ending Accumulated Other Comprehensive Loss, Defined Benefit Pension and Other Postretirement Items (21.2) [1]  
Ending Accumulated Other Comprehensive Loss, Gains and Losses on Cash Flow Hedge (0.3) [1]  
Ending Accumulated Other Comprehensive Loss, Total (21.6) [1]  
Other Income [Member]
    
Available-for-sale Securities [Abstract]    
Amounts Reclassified From Accumulated Other Comprehensive Loss, Unrealized Gains and Losses on Available-for-sale Securities, Before Tax 0.8  
Income Tax Expense (Benefit) [Member]
    
Available-for-sale Securities [Abstract]    
Amounts Reclassified From Accumulated Other Comprehensive Loss, Unrealized Gains and Losses on Available-for-sale Securities, Tax (0.3) [2]  
Pension and Other Postretirement Benefit Plans [Abstract]    
Amounts Reclassified From Accumulated Other Comprehensive Loss, Defined Benefit Pension and Other Postretirement Items, Tax $ 2.0  
[1] Amounts shown are net of tax.
[2] Amounts in parentheses indicate charges to net income.
[3] These components of accumulated other comprehensive loss are included in the computation of net pension and other postretirement benefit expense. (See Note 13. Pension and Other Postretirement Benefit Plans.)
[4] There were no amounts reclassified from accumulated other comprehensive loss related to the cash flow hedge.