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Notes Payable - Interest Paid on Notes Payable (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Debt Instrument [Line Items]      
Interest Paid $ 37.7 $ 39.3 $ 38.4
Notes Payable under Revolving Credit Agreement
      
Debt Instrument [Line Items]      
Interest Paid 0.8 2.3 1.2
Senior Notes [Member] | Senior Notes, 6% Due May 15, 2017 [Member]
      
Debt Instrument [Line Items]      
Interest Paid 21.6 21.6 21.6
Senior Notes [Member] | Senior Notes, 6% Due November 30, 2015 [Member]
      
Debt Instrument [Line Items]      
Interest Paid 15.0 15.0 15.2
Mortgage Note Payable [Member]
      
Debt Instrument [Line Items]      
Interest Paid $ 0.3 $ 0.4 $ 0.4