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Consolidated Statements of Changes in Shareholders' Equity Statement - USD ($)
$ in Millions
Total
Serial Preferred Stock
Preferred Shares, No Par Value
Common Shares, $1.00 Par Value
Paid-In Capital
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Series B Preferred Stock
Serial Preferred Stock
Voting Preference Shares
Cash dividends declared on common stock (in dollars per share) $ 0.30                
Cash dividends declared on Serial Preferred Shares, Series B (in dollars per share)               $ 26.875  
Balance, Beginning of period at Dec. 31, 2021     $ 493.9 $ 584.4 $ 1,772.9 $ 15,339.7 $ 40.7    
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Net income (loss) $ (104.9)         (104.9)      
Treasury shares purchased       (0.7) (2.2) (75.7)      
Cash dividends declared on common shares ($0.10, $0.10, $0.30, and $0.30 per share)           (175.2)      
Cash dividends declared on Serial Preferred Shares, Series B ($20.67700, $26.875, $39.60163, and $26.875 per share)           (13.4)      
Net restricted equity awards issued/vested       1.4 (1.4)        
Amortization of equity-based compensation         69.7        
Reinvested dividends on restricted stock units         0.6 (0.6)      
Other, net           17.6      
Other comprehensive income (loss) (3,170.6)           (3,170.6)    
Balance, End of period at Sep. 30, 2022 $ 14,776.2   493.9 585.1 1,839.6 14,987.5 (3,129.9)    
Cash dividends declared on common stock (in dollars per share) $ 0.10                
Cash dividends declared on Serial Preferred Shares, Series B (in dollars per share)               26.875  
Balance, Beginning of period at Jun. 30, 2022     493.9 584.9 1,815.2 14,967.7 (2,209.0)    
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Net income (loss) $ 124.1         124.1      
Treasury shares purchased       (0.4) (1.3) (47.4)      
Cash dividends declared on common shares ($0.10, $0.10, $0.30, and $0.30 per share)           (58.4)      
Cash dividends declared on Serial Preferred Shares, Series B ($20.67700, $26.875, $39.60163, and $26.875 per share)           (13.4)      
Net restricted equity awards issued/vested       0.6 (0.6)        
Amortization of equity-based compensation         26.0        
Reinvested dividends on restricted stock units         0.3 (0.3)      
Other, net           15.2      
Other comprehensive income (loss) (920.9)           (920.9)    
Balance, End of period at Sep. 30, 2022 $ 14,776.2   493.9 585.1 1,839.6 14,987.5 (3,129.9)    
Preferred stock, no par value               $ 0  
Common shares, par value (USD per share) $ 1.00                
Preferred stock, shares authorized (shares)   20,000,000.0           500,000 5,000,000.0
Preferred stock, shares issued (shares)               500,000 0
Preferred stock, no par value               $ 0  
Common shares, par value (USD per share) 1.00                
Preferred stock, shares authorized (shares)   20,000,000.0           500,000  
Preferred stock, shares issued (shares)               500,000  
Cash dividends declared on common stock (in dollars per share) $ 0.30                
Cash dividends declared on Serial Preferred Shares, Series B (in dollars per share)               $ 39.60163  
Balance, Beginning of period at Dec. 31, 2022 $ 15,891.0   493.9 584.9 1,893.0 15,721.2 (2,802.0)    
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Net income (loss) 1,914.6         1,914.6      
Treasury shares purchased       (0.6) (2.1) (77.1)      
Cash dividends declared on common shares ($0.10, $0.10, $0.30, and $0.30 per share)           (175.4)      
Cash dividends declared on Serial Preferred Shares, Series B ($20.67700, $26.875, $39.60163, and $26.875 per share)           (19.8)      
Net restricted equity awards issued/vested       0.7 (0.7)        
Amortization of equity-based compensation         86.7        
Reinvested dividends on restricted stock units         1.0 (1.0)      
Other, net           18.4      
Other comprehensive income (loss) (240.4)           (240.4)    
Balance, End of period at Sep. 30, 2023 $ 17,395.3   493.9 585.0 1,977.9 17,380.9 (3,042.4)    
Cash dividends declared on common stock (in dollars per share) $ 0.10                
Cash dividends declared on Serial Preferred Shares, Series B (in dollars per share)               20.67700  
Balance, Beginning of period at Jun. 30, 2023     493.9 585.3 1,935.7 16,350.4 (2,654.0)    
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Net income (loss) $ 1,121.3         1,121.3      
Treasury shares purchased       (0.3) (1.1) (38.3)      
Cash dividends declared on common shares ($0.10, $0.10, $0.30, and $0.30 per share)           (58.5)      
Cash dividends declared on Serial Preferred Shares, Series B ($20.67700, $26.875, $39.60163, and $26.875 per share)           (10.3)      
Net restricted equity awards issued/vested       0.0 0.0        
Amortization of equity-based compensation         42.9        
Reinvested dividends on restricted stock units         0.4 (0.4)      
Other, net           16.7      
Other comprehensive income (loss) (388.4)           (388.4)    
Balance, End of period at Sep. 30, 2023 $ 17,395.3   $ 493.9 $ 585.0 $ 1,977.9 $ 17,380.9 $ (3,042.4)    
Preferred stock, no par value               $ 0  
Common shares, par value (USD per share) $ 1.00                
Preferred stock, shares authorized (shares)   20,000,000.0           500,000 5,000,000.0
Preferred stock, shares issued (shares)               500,000 0