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Condensed Consolidated Statement of Comprehensive Income (parenthetical) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Condensed Consolidated Statement of Comprehensive Income (parenthetical) [Abstract]
Adjustment to pension and other benefit plans tax impact	$ 1.2	$ 1.4	$ 2.4	$ 2.9
Unrealized gain or loss on investment tax impact	0.2	0	0.2	0.1
Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax	$ 0	$ 0	$ 0.2	$ 0.1

Tax effect of the increase (decrease) in the value of the projected benefit obligation and the (increase) decrease in the value of the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption that has not been recognized in net periodic benefit cost.

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- Definition

Tax effect of the change in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Also includes an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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