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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, 2011	Dec. 31, 2012 Pension Plans, Defined Benefit [Member]	Dec. 31, 2012 Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year, Description		35	16
Defined Benefit Plan, Expected Future Benefit Payments in Year One	$ 51.1
Defined Benefit Plan, Expected Future Benefit Payments in Year Two	52.9
Defined Benefit Plan, Expected Future Benefit Payments in Year Three	54.8
Defined Benefit Plan, Expected Future Benefit Payments in Year Four	56.4
Defined Benefit Plan, Expected Future Benefit Payments in Year Five	57.2
Defined Benefit Plan, Expected Future Benefit Payments in Five Fiscal Years Thereafter	$ 300.7

Descriptive information regarding the employer's best estimate, as soon as it can be reasonably determined, of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position. Estimated contributions may be presented in the aggregate combining (1) contributions required by funding regulations or laws, (2) discretionary contributions, and (3) noncash contributions. Description may include a range of expected contributions, required minimum contribution, whether the expected contribution is discretionary, and further explanation.

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