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Background And Basis of Presentation (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Proceeds from Divestiture of Businesses, Net of Cash Divested	$ 462.6
Sale of business segment	449.0
Gain on sale of business segment, pre tax	99.8
Gain on sale of business segment, after tax	16.2
HR Management [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Proceeds from Divestiture of Businesses, Net of Cash Divested			78.0
Noncash or Part Noncash Divestiture, Amount of Consideration Received			15.0
Sale of business segment			93.0
Gain on sale of business segment, pre tax	0	0	35.2
Gain on sale of business segment, after tax			5.6
Discontinued Operation, Tax Effect of Income (Loss) from Disposal of Discontinued Operation	$ 0	$ (6.5)	$ 29.6

Amount of gain (loss), before tax expense or benefit and not previously recognized, resulting from the sale of a business component.

Amount of gain (loss), after tax expense or benefit and not previously recognized, resulting from the sale of a business component.

Amount of tax expense or benefit on gain (loss), not previously recognized, resulting from the sale of a business component.

Amount of noncash consideration received for selling an asset or business through a noncash (or part noncash) transaction.