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Employee Benefit Plans Expected Future Pension and Other Postretirement Payments (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2014
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, estimated future employer contributions in next fiscal year   $ 17.0
Defined benefit plan, expected future benefit payments in year one 55.9  
Defined benefit plan, expected future benefit payments in year two 57.3  
Defined benefit plan, expected future benefit payments in year three 57.8  
Defined benefit plan, expected future benefit payments in year four 59.0  
Defined benefit plan, expected future benefit payments in year five 59.4  
Defined benefit plan, expected future benefit payments in five fiscal years thereafter $ 309.2