Discontinued Operations (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011
Discontinued Operations and Disposal Groups [Abstract]
Disposal Group, Including Discontinued Operation, Revenue	$ 48.4	$ 1.8
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax	8.2	21.5
Discontinued Operation, Tax Effect of Discontinued Operation	4.2	5.6
Assets of Disposal Group, Including Discontinued Operation	156.3		143.7
Liabilities of Disposal Group, Including Discontinued Operation	$ 65.9		$ 86.3

Overall income (loss) from a disposal group that is classified as a component of the entity, before income tax, reported as a separate component of income before extraordinary items. Includes the following (before income tax): income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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Tax effect allocated to a disposal group that is classified as a component of the entity reported as a separate component of income before extraordinary items. Includes the tax effects of the following: income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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