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Pension and Postretirement Plans (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Jun. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Pension Plans, Defined Benefit [Member]
Jun. 30, 2014
Pension Plans, Defined Benefit [Member]
Sep. 30, 2013
Pension Plans, Defined Benefit [Member]
Jun. 30, 2013
Pension Plans, Defined Benefit [Member]
Sep. 30, 2014
Pension Plans, Defined Benefit [Member]
Sep. 30, 2013
Pension Plans, Defined Benefit [Member]
Dec. 31, 2014
Pension Plans, Defined Benefit [Member]
Sep. 30, 2014
Other Postretirement Benefit Plans, Defined Benefit [Member]
Sep. 30, 2013
Other Postretirement Benefit Plans, Defined Benefit [Member]
Sep. 30, 2014
Other Postretirement Benefit Plans, Defined Benefit [Member]
Sep. 30, 2013
Other Postretirement Benefit Plans, Defined Benefit [Member]
Dec. 31, 2014
Other Postretirement Benefit Plans, Defined Benefit [Member]
Dec. 31, 2013
Real Estate Funds [Member]
Defined Benefit Plan Disclosure [Line Items]                                    
Capitalized portion of defined benefit contribution percent 10.00% 10.00%   10.00% 10.00%                          
Increase (Decrease) in Pension Plan Obligations     $ (10.3)                              
Increase (Decrease) in Postretirement Obligations   (26.1)                                
Defined Benefit Plan, Fair Value of Plan Assets                                   30.8
Defined Benefit Plan, Actual Plan Asset Allocations                                   8.00%
Defined Benefit Plan, Expected Contributions in Current Fiscal Year             32         21         13  
Pension and Other Postretirement Benefit Contributions                   19.3         9.3      
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]                                    
Service cost           0.3   0.3   0.8 1.7   0.1 0.1 0.2 0.3    
Interest cost on projected benefit obligation           5.2   4.7   15.7 14.1   1.0 1.0 3.0 3.0    
Expected return on plan assets           (7.0)   (6.3)   (21.1) (19.2)   0 0 0 0    
Curtailment gain 0 0   0 (0.6)       (0.6) 0 (0.6)       0 0    
Amortization of:                                    
Prior service cost (benefit)           0.1   0.1   0.2 0.2   (3.9) (3.7) (11.6) (10.2)    
Actuarial loss           4.3   5.4   13.0 16.4   1.4 1.4 4.1 4.3    
Total amortization           4.4   5.5   13.2 16.6   (2.5) (2.3) (7.5) (5.9)    
Benefit costs           $ 2.9   $ 4.2   $ 8.6 $ 12.6   $ (1.4) $ (1.2) $ (4.3) $ (2.6)