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Notes Payable and Long-Term Debt - Long-term Debt Maturities (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended 0 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Mortgages
Jan. 06, 2014
Subsequent Event
Dec. 31, 2013
Revolving Credit Facility
Line of Credit
Debt Instrument [Line Items]            
Maturity terms for long-term debts 5 years          
Debts mature in 2014 $ 105.2          
Repayment of term loan 380.3 257.2 145.9   60.0  
Debts mature in 2015 45.1          
Debts mature in 2016 166.7     94.0    
Debts mature in 2017 133.9         95.0
Debts mature in 2018 31.9          
Debts mature after 2018 $ 226.1