Employee Benefit Plans Expected Future Pension and Other Postretirement Payments (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	1 Months Ended
	Mar. 31, 2012	Jan. 31, 2015	Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, expected future benefit payments in year one			$ 55.3
Defined benefit plan, expected future benefit payments in year two			55.4
Defined benefit plan, expected future benefit payments in year three			56.4
Defined benefit plan, expected future benefit payments in year four			56.6
Defined benefit plan, expected future benefit payments in year five			56.9
Defined benefit plan, expected future benefit payments in five fiscal years thereafter			293.6
Pension Contributions in Excess of Statutory Minimums	114.7
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, estimated future employer contributions in next fiscal year		$ 16.0