Self-Insured Risks - Textual (Details) (USD $) In Millions, unless otherwise specified				3 Months Ended	12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2012	Dec. 31, 2013 Statistical Confidence Level [Member]	Dec. 31, 2013 Statistical Confidence Level [Member]	Dec. 31, 2012 Statistical Confidence Level [Member]	Dec. 31, 2011 Statistical Confidence Level [Member]
Insurance Reserves [Line Items]
Maximum Self-Insured Risk	$ 24
Self-Insurance Reserves, Current	42.1		41.8
Statistical Confidence Level		70.00%		50.00%	50.00%
Increase (Decrease) in Self Insurance Reserve				$ (6.7)	$ (6.7)	$ 0	$ (2.8)
Number of Individual Claims Covered by Self-Insured Risk Reserves	1,150		800