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Notes Payable (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Aug. 02, 2011
Dec. 31, 2010
Debt Instrument      
Long-term Debt, Fair Value $ 927.8   $ 957.6
Excess fair value over carrying value of long-term debt 12.0   5.6
Long-term Debt 915.8   952.0
Convertible Debt
     
Debt Instrument      
Long-term Debt, Fair Value   278.5  
Long-term Debt 279.5   0
Unsecured notes, net of discount, interest payable semi-annually at 6.60%, due May 2017
     
Debt Instrument      
Long-term Debt 299.8   299.7
Unsecured notes, net of discount, interest payable semi-annually at 5.25%, due March 2013
     
Debt Instrument      
Long-term Debt 236.4   236.2
Unsecured notes, net of discount, interest payable semi-annually at 7.30%, due August 2011
     
Debt Instrument      
Long-term Debt 0   165.6
Line of Credit
     
Debt Instrument      
Long-term Debt 100.0   250.0
Notes Payable, Other Payables
     
Debt Instrument      
Long-term Debt $ 0.1   $ 0.5