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Notes Payable (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Debt Instrument [Line Items]          
Notes Payable $ 611.9   $ 611.9   $ 611.4
Interest Expense before Capitalization of Interest 9.8 9.8 19.6 20.3  
Capitalization of Interest (0.2) (0.6) (0.5) (1.4)  
Interest Expense 9.6 9.2 19.1 18.9  
Interest Paid 18.6 18.4 18.7 20.2  
Notes Payable under Revolving Credit Agreement [Member]
          
Debt Instrument [Line Items]          
Interest Expense before Capitalization of Interest 0.3 0.3 0.6 1.3  
Interest Paid 0.2 0 0.2 1.7  
Notes Payable under Revolving Credit Agreement [Member] | 2016 Credit Agreement [Member]
          
Debt Instrument [Line Items]          
Line of Credit Facility, Length of Agreement     4 years    
Line of Credit Facility, Amount Outstanding 0   0   0
Line of Credit Facility, Remaining Borrowing Capacity 325.0   325.0    
Line of Credit Facility, Maximum Borrowing Capacity 325.0   325.0   325.0
Senior Subordinated Notes [Member] | Senior Notes, 6 Percent Due May 15, 2017 [Member]
          
Debt Instrument [Line Items]          
Notes Payable 357.6   357.6   357.3
Notes Payable, Interest Rate, Stated Percentage 6.00%   6.00%    
Interest Expense before Capitalization of Interest 5.6 5.6 11.1 11.1  
Interest Paid 10.8 10.8 10.8 10.8  
Senior Subordinated Notes [Member] | Senior Notes, 6 Percent Due November 30, 2015 [Member]
          
Debt Instrument [Line Items]          
Notes Payable 248.8   248.8   248.6
Notes Payable, Interest Rate, Stated Percentage 6.00%   6.00%    
Interest Expense before Capitalization of Interest 3.8 3.8 7.7 7.7  
Interest Paid 7.5 7.5 7.5 7.5  
Mortgage Note Payabe at Amortized Cost [Member]
          
Debt Instrument [Line Items]          
Notes Payable 5.5   5.5   5.5
Interest Expense before Capitalization of Interest 0.1 0.1 0.2 0.2  
Interest Paid $ 0.1 $ 0.1 $ 0.2 $ 0.2