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Stockholders' Equity (Details Textuals)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended 60 Months Ended
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2015
$ / shares
shares
Dec. 31, 2014
shares
Dec. 31, 2008
USD ($)
Dec. 31, 2006
USD ($)
Dec. 31, 2017
Dec. 31, 2013
shares
Class of Stock [Line Items]              
Stockholders' Equity, Reverse Stock Split Pursuant to the authorization provided at a special meeting of the Company's stockholders held on September 16, 2015, the Company completed a 1-for-15 reverse stock split of the shares of the Company’s common stock on September 30, 2015 (the Reverse Stock Split). Refer to Note 1. "Summary of Significant Accounting Policies" for additional details surrounding the Reverse Stock Split. Pursuant to the authorization provided at a special meeting of the Company's stockholders held on September 16, 2015, the Company completed a 1-for-15 reverse stock split of the shares of the Company’s common stock on September 30, 2015 (the Reverse Stock Split). As a result of the Reverse Stock Split, every 15 shares of issued and outstanding common stock were combined into one issued and outstanding share of Common Stock, without any change in the par value per share.          
Schedule Of Stock By Class (Textuals) [Abstract]              
Common Stock, shares authorized 53.3            
Preferred Stock, Par or Stated Value Per Share | $ / shares $ 0.01            
Common Stock, par or Stated Value Per Share | $ / shares $ 0.01            
Number of votes entitled for common stock holders one vote per share            
Aggregate principal amount of debentures outstanding | $ $ 732.5            
Liquidation preference of perpetual preferred stock, per share | $ / shares $ 1,000            
Perpetual Preferred Stock annual cumulative dividend rate 3.0875%            
DefinedIntervalInYearstoPayDividendsonPerpetualPreferredStock           five  
ElectedMembersToServeOnCompanysBoardOfDirectors two            
Period for payment of dividend on perpetual preferred stock 10            
NumberOfFailedAmountOfDividendsOnPreferredStock six            
Authorized amount for common stock repurchase | $ $ 1,000.0            
Treasury Stock, shares 0.8 0.8          
Cost of shares repurchased | $ $ 299.6     $ 199.8 $ 99.8    
Amount available for repurchase of shares under share repurchase program | $ $ 700.4            
Shares relinquished 0.1 0.1 0.1        
Common Stock, shares outstanding 18.5 18.5 18.1       18.0
Common Stock [Member]              
Schedule Of Stock By Class (Textuals) [Abstract]              
Common Stock, shares authorized 53.3 53.3          
Common Stock, par or Stated Value Per Share | $ / shares $ 0.01 $ 0.01          
Common Stock, shares outstanding 18.5 18.5          
Preferred Stock [Member]              
Schedule Of Stock By Class (Textuals) [Abstract]              
Preferred Stock, Par or Stated Value Per Share | $ / shares $ 0.01 $ 0.01          
Preferred Stock, shares outstanding 0.0 0.0          
Preferred Stock, shares authorized 10.0 10.0          
Series Common Stock [Member]              
Schedule Of Stock By Class (Textuals) [Abstract]              
Common Stock, shares authorized 40.0 40.0          
Common Stock, par or Stated Value Per Share | $ / shares $ 0.01 $ 0.01          
Common Stock, shares outstanding 0.0 0.0          
Perpetual Preferred Stock Member              
Schedule Of Stock By Class (Textuals) [Abstract]              
Preferred Stock, shares outstanding 0.0 0.0          
Preferred Stock, shares authorized 0.8 0.8          
Treasury Stock [Member]              
Schedule Of Stock By Class (Textuals) [Abstract]              
Treasury Stock, shares 0.5