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Earnings per Common Share - Textual (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Jul. 21, 2016
Oct. 23, 2015
Jul. 31, 2016
May 31, 2016
Apr. 30, 2016
Feb. 29, 2016
Jan. 31, 2016
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Jul. 01, 2016
Dec. 31, 2015
Apr. 23, 2015
Apr. 22, 2015
Earnings per Common Share (Textual) [Abstract]                              
Cash dividends per common share, Declared               $ 0.23 $ 0.21 $ 0.46 $ 0.42        
Common Stock                              
Earnings per Common Share (Textual) [Abstract]                              
Cash dividends per common share, Declared   $ 0.23   $ 0.23   $ 0.23                  
Cash dividends per common share, Paid         $ 0.23   $ 0.23                
Dividends Payable, Current               $ 21.3   $ 21.3     $ 21.3    
Convertible Preferred Stock, Conversion Price                           $ 33.9905  
Common Stock, Par or Stated Value Per Share                           $ 0.01  
Convertible Preferred Stock, Shares Issued upon Conversion                           3,271,415  
Convertible Preferred Stock [Member]                              
Earnings per Common Share (Textual) [Abstract]                              
Preferred Stock, Par or Stated Value Per Share                             $ 0.10
Temporary Equity, Liquidation Preference Per Share                             $ 1,000
Temporary Equity, Shares Outstanding                           96,245  
2.00% Convertible Senior Subordinated Notes due 2043 [Member]                              
Earnings per Common Share (Textual) [Abstract]                              
Debt Instrument, Convertible, Conversion Price               $ 39.65   $ 39.65          
Debt Instrument, Convertible, Terms of Conversion Feature                   25.2194 shares per $1,000 principal amount          
Subsequent Event [Member] | Common Stock                              
Earnings per Common Share (Textual) [Abstract]                              
Cash dividends per common share, Declared $ 0.24                            
Cash dividends per common share, Paid     $ 0.23                        
Subsequent Event [Member] | 2.00% Convertible Senior Subordinated Notes due 2043 [Member]                              
Earnings per Common Share (Textual) [Abstract]                              
Debt Instrument, Convertible, Conversion Price                       $ 37.59      
Debt Instrument, Convertible, Shares Issued Upon Conversion                       26.6011