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Senior Notes (Tables)
12 Months Ended
Dec. 31, 2012
Senior Notes  
Summary of principal terms of senior notes

 

 
  2022
Senior
Notes
  2042
Senior
Notes
 

Issue date

    October 2012     August 2012  

Maturity date

    October 2022     August 2042  

Potential Call Date

    October 2015     August 2017  

Par value (in millions)

  $ 140.0   $ 200.0  

Call Price

    At Par     At Par  

Stated coupon

    5.25 %   6.375 %

Coupon frequency

    Quarterly     Quarterly