Consolidated Statement of Income (Parenthetical) (USD $) In Millions	12 Months Ended
Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Consolidated Income Statement Parenthetical [Abstract]
Provision for (Benefit from) Income Taxes on Income (Loss) from Discontinued Operations	$ 22.8	$ 18.6	$ 13.7
Provision for (Benefit From) Income Taxes on Gain (Loss) on Disposal of Discontinued Operations	$ 1.5	$ (0.6)	$ 3.5

Income tax expense (benefit) attributable to income (loss) from discontinued operations during the phase-out period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 144
-Paragraph 43

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 144
-Paragraph 47
-Subparagraph c

Name:	us-gaap_DiscontinuedOperationTaxEffectOfIncomeLossFromDiscontinuedOperationDuringPhaseOutPeriod
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration