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Reclassifications out of Accumulated Other Comprehensive Income (Loss) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Mar. 31, 2013
Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated Other Comprehensive Loss $ (21.0) [1]   $ (21.0) [1]   $ (21.6) [1] $ (22.0) [1]
Other Comprehensive Income (Loss) Before Reclassifications (2.5) [1]   (4.8) [1]      
Amounts Reclassified From Accumulated Other Comprehensive Loss (3.1) [1],[2]   (5.8) [1],[2]      
Net Other Comprehensive Income 0.6 [1] (0.1) 1.0 [1] 1.3    
Reclassifications Out of Accumulated Other Comprehensive Income [Abstract]            
AOCI Reclassification, Amortization of Defined Benefit Pension and Other Postretirement Items, Before Tax (5.1) [2]   (10.3) [2]      
AOCI Reclassification, Amortization of Pension and Other Postretirement Items, Prior Service Costs, Before Tax 0.7 [3]   1.2 [3]      
AOCI Reclassification, Amortization of Defined Benefit Pension and Other Postretirement Items, Actuarial Gains and Losses, Before Tax (5.8) [2],[3]   (11.5) [2],[3]      
Other Income (Expense) - Other [Member]
            
Reclassifications Out of Accumulated Other Comprehensive Income [Abstract]            
AOCI Reclassification, Unrealized Gains on Available-for-sale Securities, Before Tax     0.8      
Income Tax Expense [Member]
            
Reclassifications Out of Accumulated Other Comprehensive Income [Abstract]            
AOCI Reclassification, Unrealized Gains on Available-for-sale Securities, Tax     (0.3) [2]      
AOCI Reclassification, Amortization of Defined Benefit Pension and Other Postretirement Items, Tax 2.0   4.0      
Unrealized Gains and Losses on Available-for-sale Securities [Member]
            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated Other Comprehensive Loss 0 [1]   0 [1]   (0.1) [1] (0.1) [1]
Other Comprehensive Income (Loss) Before Reclassifications 0.1 [1]   0.6 [1]      
Amounts Reclassified From Accumulated Other Comprehensive Loss 0 [1]   0.5 [1]      
Net Other Comprehensive Income 0.1 [1]   0.1 [1]      
Defined Benefit Pension, Other Postretirement Items [Member]
            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated Other Comprehensive Loss (20.7) [1]   (20.7) [1]   (21.2) [1] (21.5) [1]
Other Comprehensive Income (Loss) Before Reclassifications (2.6) [1]   (5.5) [1]      
Amounts Reclassified From Accumulated Other Comprehensive Loss (3.1) [1],[2]   (6.3) [1],[2]      
Net Other Comprehensive Income 0.5 [1]   0.8 [1]      
Gains and Losses on Cash Flow Hedge [Member]
            
Accumulated Other Comprehensive Income (Loss) [Line Items]            
Accumulated Other Comprehensive Loss (0.3) [1]   (0.3) [1]   (0.3) [1] (0.4) [1]
Other Comprehensive Income (Loss) Before Reclassifications 0 [1]   0.1 [1]      
Amounts Reclassified From Accumulated Other Comprehensive Loss 0 [1]   0 [1]      
Net Other Comprehensive Income $ 0 [1]   $ 0.1 [1]      
[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.)