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Pension and Postretirement Health and Life Benefits (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 7 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2013
Jun. 30, 2011
Mar. 31, 2011
Aug. 04, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Pension Plan, Defined Benefit [Member]
Jun. 30, 2013
Pension Plan, Defined Benefit [Member]
Dec. 31, 2014
Pension Plan, Defined Benefit [Member]
Dec. 31, 2013
Pension Plan, Defined Benefit [Member]
Dec. 31, 2012
Pension Plan, Defined Benefit [Member]
Dec. 31, 2011
Pension Plan, Defined Benefit [Member]
Dec. 31, 2014
Other Postretirement Benefit Plan, Defined Benefit [Member]
Dec. 31, 2013
Other Postretirement Benefit Plan, Defined Benefit [Member]
Dec. 31, 2012
Other Postretirement Benefit Plan, Defined Benefit [Member]
Dec. 31, 2011
Other Postretirement Benefit Plan, Defined Benefit [Member]
Approximate Number of Plan Participants                 6,100     6,100       4,000    
Defined Benefit Plan, Accumulated Benefit Obligation                 $ 906.0     $ 906.0 $ 1,040.4          
Curtailment (gain) loss   1.9 3.2             0.7   (12.6) 0 (3.2)   1.0 0 (1.9)
Decrease in pension liability, curtailments                   32.7   20.1 0     (24.6) 0  
Additional credited service charge                 22.9                  
Increase in pension liability, additional credit service                 47.9                  
Net defined benefit plan costs for former Portsmouth employees           8.9 13.2                      
Expected defined benefit plan contributions for next fiscal year         37.7                          
Expected defined benefit plan contributions for next fiscal year under ERISA         35.5                          
Expected defined benefit plan contributions for next fiscal year for non-qualified plans         2.2                          
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, before Tax           187.8 (55.1) (136.2)     1.3       0.5      
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Prior Service Cost (Credit), before Tax                     0.1 0 0 0   (27.8) 0 0
Defined Contribution Plan, Cost Recognized           6.3 6.1 7.7                    
Defined Contribution Plan, Employer Matching Contribution, Percent 7.00%     4.00%                            
Executive Deferred Compensation Plan, Cost Recognized             $ 0.1 $ 0.1