Divestitures (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Sale of business segment	$ 449.0
Cash received from sale of business segment	462.6
Proceeds from disposition of business	0		10.0		0
Gain on sale of business segment, pre tax	99.8
Gain on sale of business segment, after tax	16.2
Information Management [Member]
Sale of business segment	449.0
Transaction costs related to the sale of business	22.8
Gain on sale of business segment, pre tax	99.8	[1]	0	[1]	0	[1]
Gain on sale of business segment, after tax	16.2
Federal, state and foreign income tax obligation	83.6		0		0
Elimination of goodwill and intangible assets from sale of business segment	201.7
Cost allocated for discontinued business segment included in continuing operations	8.8		23.6		28.4
Transition Service Agreement Period	24 months
Revenue under transition services agreements subsequent to close of sale	13.8
F&A [Member]
Proceeds from disposition of business			10.0
Gain on sale of business segment, pre tax			7.0
Gain on sale of business segment, after tax			4.3
Elimination of goodwill and intangible assets from sale of business segment			2.6
HR Management [Member]
Sale of business segment					93.0
Cash received from sale of business segment					78.0
Note received in divestiture					15.0
Value of principal of zero coupon note received in sale during second anniversary					5.0
Value of principal of zero coupon note received in sale during third anniversary					10.0
Cash paid to settle obligations					28.2
Gain on sale of business segment, pre tax	0		0		35.2
Gain on sale of business segment, after tax					5.6
Federal, state and foreign income tax obligation	0		(6.5)		29.6
Elimination of goodwill and intangible assets from sale of business segment					67.1
Cost allocated for discontinued business segment included in continuing operations					9.1
Revenue under transition services agreements subsequent to close of sale			$ 14.4		$ 24.0
HR Management [Member] | Minimum [Member]
Transition Service Agreement Period					3 months
HR Management [Member] | Maximum [Member]
Transition Service Agreement Period					18 months

[1] (2) Includes $22.8 of transaction costs related to the sale for December 31, 2012.