Discontinued Operations (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended	3 Months Ended	9 Months Ended	3 Months Ended		9 Months Ended					12 Months Ended		3 Months Ended	9 Months Ended
	Dec. 31, 2012	Sep. 30, 2012 RTS	Sep. 30, 2012 RTS	Sep. 30, 2013 MDOC	Sep. 30, 2012 MDOC	Sep. 30, 2013 MDOC	Sep. 30, 2012 MDOC	Jul. 19, 2012 East Mississippi Correctional Facility bed	Aug. 13, 2012 Marshall County Correctional Facility bed	Jul. 01, 2012 Walnut Grove Youth Correctional Facility bed	Dec. 31, 2012 Services Agreement	Dec. 31, 2012 License Agreement	Sep. 30, 2013 Services and Licensing Agreement	Sep. 30, 2013 Services and Licensing Agreement
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from divestiture of businesses	$ 33.3
Period of working capital adjustment after divestiture	0 years 0 months 105 days
Proceeds from divestiture of business, final	32.3
Long-Term Purchase Commitment, Earn-Out	5.0
Services agreement contract term											5 years
Sales Revenue, Services, Other											1.8
Licensing Agreement Contract Term												5 years
Licenses Revenue												0.4
Sales service revenue other and license revenue													0.6	1.6
Number of beds discontinued								1,500	1,000	1,450
Discontinued operations, revenue		42.2	124.8		2.4		24.7
Discontinued operations, pre-tax loss		3.1	8.6		(2.8)		(3.7)
Charge of insurance liability claim, loss from discontinued operations				$ 2.3		$ 2.3