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Pension and Other Postretirement Benefit Plans (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Pension [Member]
        
Components of Net Periodic Benefit Expense [Abstract]        
Service Cost $ 2.1 $ 2.5 $ 4.2 $ 5.0
Interest Cost 7.5 6.5 14.9 13.0
Expected Return on Plan Assets (9.5) (8.8) (19.1) (17.6)
Amortization of Prior Service Costs (Credits) 0 0 0.1 0.1
Amortization of Net Loss 3.5 5.4 7.1 10.7
Net Periodic Benefit Expense (Income) 3.6 5.6 7.2 11.2
Contributions     19.5 0
Estimated Future Contributions     0  
Other Postretirement [Member]
        
Components of Net Periodic Benefit Expense [Abstract]        
Service Cost 0.8 1.0 1.7 2.0
Interest Cost 1.9 1.7 3.7 3.4
Expected Return on Plan Assets (2.6) (2.4) (5.2) (4.9)
Amortization of Prior Service Costs (Credits) (0.6) (0.7) (1.2) (1.3)
Amortization of Net Loss 0.1 0.4 0.2 0.8
Net Periodic Benefit Expense (Income) (0.4) 0 (0.8) 0
Contributions     0 10.8
Estimated Future Contributions     $ 0