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Consolidated Statement of Equity - USD ($)
$ in Millions
Total
Retained Earnings [Member]
Accumulated Other Comprehensive Loss [Member]
Unearned ESOP Shares [Member]
Common Stock [Member]
Non-Controlling Interest in Subsidiaries [Member]
Beginning Balance at Dec. 31, 2014 $ 1,611.2 $ 530.1 $ (21.1) $ (7.2) $ 1,107.6 $ 1.8
Comprehensive Income            
Net Income 141.5 141.1       0.4
Other Comprehensive Income – Net of Tax            
Unrealized Gain (Loss) on Securities (0.5)   (0.5)      
Unrealized Gain on Derivatives 0.1   0.1      
Defined Benefit Pension and Other Postretirement Plans (3.0)   (3.0)      
Total Comprehensive Income 138.1          
Common Stock Issued 163.8       163.8  
Dividends Declared (97.9) (97.9)        
ESOP Shares Earned 7.2     7.2    
Ending Balance at Dec. 31, 2015 1,822.4 573.3 (24.5) 0.0 1,271.4 2.2
Comprehensive Income            
Net Income 155.8 155.3       0.5
Other Comprehensive Income – Net of Tax            
Unrealized Gain (Loss) on Securities (0.2)   (0.2)      
Unrealized Gain on Derivatives 0.0          
Defined Benefit Pension and Other Postretirement Plans (3.5)   (3.5)      
Total Comprehensive Income 152.1          
Common Stock Issued 35.9       35.9  
Dividends Declared (102.7) (102.7)        
Common Stock Retired (8.0)          
Acquisition of Non-Controlling Interest (6.7)       (4.0) (2.7)
Ending Balance at Dec. 31, 2016 1,893.0 625.9 (28.2) 0.0 1,295.3 0.0
Comprehensive Income            
Net Income 172.2 172.2       0.0
Other Comprehensive Income – Net of Tax            
Unrealized Gain (Loss) on Securities 0.9   0.9      
Unrealized Gain on Derivatives 0.0          
Defined Benefit Pension and Other Postretirement Plans 4.7   4.7      
Total Comprehensive Income 177.8          
Common Stock Issued 106.1       106.1  
Dividends Declared (108.7) (108.7)        
Ending Balance at Dec. 31, 2017 $ 2,068.2 $ 689.4 $ (22.6) $ 0.0 $ 1,401.4 $ 0.0