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Common Shareholders' Equity (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Nov. 17, 2006
Dec. 31, 2013
Common Stock
Dec. 31, 2012
Common Stock
Dec. 31, 2011
Common Stock
Dec. 31, 2013
Restricted Stock
Dec. 31, 2012
Restricted Stock
Dec. 31, 2011
Restricted Stock
Dec. 31, 2012
Performance Shares [Member]
Dec. 31, 2013
Common Stock
Dec. 31, 2012
Common Stock
Dec. 31, 2011
Common Stock
Dec. 31, 2011
Combination Two [Member]
STO
Dec. 31, 2011
Combination Two [Member]
Common Stock
Dec. 31, 2013
General Board Authorization [Member]
Dec. 31, 2012
General Board Authorization [Member]
Dec. 31, 2011
General Board Authorization [Member]
Dec. 31, 2010
General Board Authorization [Member]
Dec. 31, 2013
Other Pension Plan, Postretirement or Supplemental Plans, Defined Benefit [Member]
Combination Three [Member]
Dec. 31, 2012
Other Pension Plan, Postretirement or Supplemental Plans, Defined Benefit [Member]
Combination Three [Member]
Dec. 31, 2011
Other Pension Plan, Postretirement or Supplemental Plans, Defined Benefit [Member]
Combination Three [Member]
Dec. 31, 2012
Tender Offer [Member]
Combination Two [Member]
Dec. 31, 2012
Tender Offer [Member]
Combination Two [Member]
Common Stock
Common Shares Repurchased and Retired [Abstract]                                                  
Authorized repurchase of common shares   2,600,000   1,000,000                                          
Additional authorized repurchase of common shares                                 545,496 1,000,000   600,000          
Common shares repurchased and retired during the period   1,329,640                   141,535 1,329,640 646,502   332,346 140,000 502,801 313,967           816,829
Number of Modified Dutch Auction                             2                    
Value of common shares repurchased and retired during the period $ 79.8 $ 669.1 $ 253.0   $ 79.8 $ 669.1 $ 253.0               $ 138.8   $ 78.9 $ 256.0 $ 114.0         $ 408.6  
Value of each common share repurchased and retired during the period (in dollars per share) $ 564.00 $ 503.00 $ 390.00                       $ 417.55   $ 564.00 $ 508.00 $ 364.00   $ 1,535.00 $ 10,010.00 $ 189.00 $ 500.00  
Stock Issued During Period, Shares, New Issues 27,310 44,054 29,432         25,720 700   9,577                            
Common shares, issued shares 6,176,739 6,290,964             32,160 27,250                              
Common Shares Issued [Abstract]                                                  
Shares issued to directors (in shares) 1,590 1,617 2,182                                            
Dividends, Common Stock [Abstract]                                                  
Cash dividends declared and paid $ 6.2 $ 6.6 $ 8.0                                            
Dividends delared and paid (in dollars per share) $ 1.00 $ 1.00 $ 1.00