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 |