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Consolidated Statement of Comprehensive Income Parenthetical (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Other Comprehensive Income (Loss), Tax [Abstract]
Unrealized Gain on Securities, Tax	$ 0.7	$ 0.6
Unrealized Loss on Derivatives, Tax	(0.1)	0
Defined Benefit Pension and Other Postretirement Benefit Plans, Tax	$ 0.3	$ 0.3

Tax effects of the increase (decrease) to accumulated comprehensive income during the period related to benefit plans. While for technical reasons this element has no balance attribute, the default assumption is a credit balance consistent with its label.

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- Definition

Tax effect on the change in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

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- Definition

Tax effect on gross appreciation or the gross loss in value of the total of unsold securities during the period being reported on.

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