The aggregate amount provided for estimated restructuring charges, remediation costs, and asset impairment loss during an accounting period. Generally, these items are either unusual or infrequent, but not both (in which case they would be extraordinary items).

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.3)

-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

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

FLEET TRANSITION (DETAILS) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended		1 Months Ended	3 Months Ended		9 Months Ended	3 Months Ended	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Oct. 31, 2011 Disposal of Aircraft [Member] Fleet Transition [Member] Q200 [Member] aircraft	Sep. 30, 2011 Fleet Transition [Member] Q200 [Member] aircraft	Sep. 30, 2011 Q200 [Member]	Sep. 30, 2011 Q200 [Member]	Sep. 30, 2011 CRJ 700 [Member]	Sep. 30, 2011 CRJ 700 [Member]	Sep. 30, 2010 CRJ 700 [Member]
Restructuring Cost and Reserve [Line Items]
Fleet transition costs	$ 2.0	$ 9.8	$ 38.9	$ 13.2			$ 4.6	$ 10.6	$ (2.6)	$ 28.3	$ 10.3
Number Of Aircraft Sold					13
Number Of Aircraft To Be Sold						16