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Retirement Benefits Activity (Details) (USD $) In Millions, unless otherwise specified			3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended
	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2013 Qualified Pension Benefits [Member]	Jun. 30, 2013 Qualified Pension Benefits [Member]	Jun. 30, 2013 SERP Pension Benefits [Member]	Jun. 30, 2013 SERP Pension Benefits [Member]	Jun. 30, 2013 Other Benefit [Member]	Jun. 30, 2013 Other Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair Value of Plan Assets	$ 560.1	$ 531.2
Aggregate expected contributions			20.4	20.4	5.0	5.0	0.8	0.8
Company Contribution			$ 5.1	$ 10.2	$ 2.7	$ 3.2	$ 0.3	$ 0.7

Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

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