Income Taxes (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Oct. 04, 2012
Income Tax Contingency [Line Items]
Effective Income Tax Rate, Continuing Operations	38.00%	40.00%
Other Assets			$ 2.9
Accrued interest epense related to unrecognized income tax benefits	0.2
Gross unrecognized tax benefits	1.9
Total amount of unrecognized tax benefits, if recognized, would affect the effective tax rate	0.8
Reduction in Unrecognized Tax Benefits Related to HRE Trust Fund	6.8
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit	1.1
HRE Trust Fund [Member]
Income Tax Contingency [Line Items]
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit	0.4
State and Local Jurisdiction [Member]
Income Tax Contingency [Line Items]
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit	$ 0.7