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Defined Benefit Plans (Narrative) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011	Aug. 02, 2011 VAC [Member]
Defined Benefit Plan Disclosure [Line Items]
Pension liabilities	$ 214.6	$ 212.5	$ 149.8

The amount of acquisition cost of a business combination allocated to a liability for the projected benefit obligation in excess of plan assets or an asset for plan assets in excess of the projected benefit obligation of a single-employer defined benefit pension plan.

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