Divestitures (Schedule Of Results Included In Discontinued Operations) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain (loss) on disposition	$ 99.8
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	72.4		52.3		56.6
Information Management [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue from discontinued operations	128.8		328.8		340.1
Income (loss) before tax	23.7	[1]	58.2	[1]	59.3	[1]
Gain (loss) on disposition	99.8	[2]	0	[2]	0	[2]
Income (loss) before income taxes	123.5		58.2		59.3
Income tax on operations	7.9		12.4		24.2
Income tax on gain (loss) on dispostion	83.6		0		0
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	32.0		45.8		35.1
HR Management [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue from discontinued operations	0		0		107.2
Income (loss) before tax	0		0		25.3
Gain (loss) on disposition	0		0		35.2
Income (loss) before income taxes	0		0		60.5
Income tax on operations	(40.4)		0		9.4
Income tax on gain (loss) on dispostion	0		(6.5)		29.6
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	$ 40.4		$ 6.5		$ 21.5

[1] (1) Excludes costs previously allocated to Information Management that did not meet the criteria for presentation within discontinued operations of $8.8, $23.6 and $28.4 for December 31, 2012, 2011 and 2010, respectively.

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