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Pensions Benefit Obligation in Excess of Assets (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Pension Plans with Projected Benefit Obligations in Excess of Plan Assets [Abstract]
Projected benefit obligation	$ 1,165.6	$ 945.9
Fair value of plan assets	858.0	734.3
Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets [Abstract]
Accumulated benefit obligation	987.9	910.5
Fair value of plan assets	$ 717.8	$ 725.6
Defined Benefit Plan, Measurement Date	December 31

If aggregate disclosures are presented, the aggregate pension accumulated benefit obligation for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented.

+ References+ Details

- Definition

If aggregate disclosures are presented, the aggregate fair value of plan assets for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented.

+ References+ Details