Summary of Financial Statement Preparation and Significant Accounting Policies (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended			3 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Minimum [Member] Support equipment [Member]	Dec. 31, 2013 Minimum [Member] Vehicles and other equipment [Member]	Dec. 31, 2013 Maximum [Member] Support equipment [Member]	Dec. 31, 2013 Maximum [Member] Vehicles and other equipment [Member]	Dec. 31, 2013 Boeing 767 and 757 aircraft and flight equipment [Member] Minimum [Member] Aircraft and Flight Equipment [Member]	Dec. 31, 2013 Boeing 767 and 757 aircraft and flight equipment [Member] Maximum [Member] Aircraft and Flight Equipment [Member]	Jan. 31, 2014 Subsequent Event [Member]
Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Line Items]
Line of Credit Facility, Amount Outstanding										$ 15.0
Property, plant and equipment, useful life				5 years	3 years	10 years	8 years	10 years	20 years
Capitalized interest	1.1	2.8	2.2
Other liabilities for self-insured reserves	$ 28.3	$ 31.6