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Consolidated Statement of Changes in Stockholders' Equity - USD ($)
$ in Millions
Total
Director [Member]
Cumulative change related to the adoption of ASU 2016-13
Cumulative effect, period of adoption, adjusted balance
Common stock
Common stock
Cumulative change related to the adoption of ASU 2016-13
Common stock
Cumulative effect, period of adoption, adjusted balance
Retained earnings
Retained earnings
Cumulative change related to the adoption of ASU 2016-13
Retained earnings
Cumulative effect, period of adoption, adjusted balance
Accumulated other comprehensive income (loss)
Accumulated other comprehensive income (loss)
Cumulative change related to the adoption of ASU 2016-13
Accumulated other comprehensive income (loss)
Cumulative effect, period of adoption, adjusted balance
Equity, beginning balance at Dec. 31, 2019 $ 2,013.9   $ (24.1) $ 1,989.8 $ 1,049.3 $ 0.0 $ 1,049.3 $ 953.6 $ (24.1) $ 929.5 $ 11.0 $ 0.0 $ 11.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]                          
Net income 66.0       0.0     66.0     0.0    
Other comprehensive income (loss), net of tax expense 54.2       0.0     0.0     54.2    
Common stock transactions:                          
Common shares purchased and retired $ (32.6)       (32.6)     0.0     0.0    
Common shares issued (in shares) 19,491                        
Common shares issued $ 0.0       0.0     0.0     0.0    
Non-vested common shares issued 0.0       0.0     0.0     0.0    
Non-vested common shares forfeited or canceled 0.0       0.0     0.0     0.0    
Stock options exercised, net of share tendered in payment of option price and income tax withholding amounts 0.7       0.7     0.0     0.0    
Stock-based compensation expense 3.8       3.8     0.0     0.0    
Common cash dividend declared (83.0)       0.0     (83.0)     0.0    
Equity, ending balance at Jun. 30, 2020 1,998.9       1,021.2     912.5     65.2    
Equity, beginning balance at Mar. 31, 2020 1,956.1       1,018.7     897.6     39.8    
Increase (Decrease) in Stockholders' Equity [Roll Forward]                          
Net income 36.7       0.0     36.7     0.0    
Other comprehensive income (loss), net of tax expense 25.4       0.0     0.0     25.4    
Common stock transactions:                          
Common shares purchased and retired $ 0.0       0.0     0.0     0.0    
Common shares issued (in shares) 19,200                        
Common shares issued $ 0.0       0.0     0.0     0.0    
Non-vested common shares issued 0.0       0.0     0.0     0.0    
Non-vested common shares forfeited or canceled 0.1       (0.1)     0.0     0.0    
Stock options exercised, net of share tendered in payment of option price and income tax withholding amounts 2.4       2.4     0.0     0.0    
Stock-based compensation expense (21.8)       0.0     (21.8)     0.0    
Equity, ending balance at Jun. 30, 2020 1,998.9       1,021.2     912.5     65.2    
Equity, beginning balance at Dec. 31, 2020 1,959.8       941.1     962.1     56.6    
Increase (Decrease) in Stockholders' Equity [Roll Forward]                          
Net income 93.9       0.0     93.9     0.0    
Other comprehensive income (loss), net of tax expense (32.5)       0.0     0.0     (32.5)    
Common stock transactions:                          
Common shares purchased and retired $ (5.4)       (5.4)     0.0     0.0    
Common shares issued (in shares) 19,081 19,081                      
Common shares issued $ 0.0       0.0     0.0     0.0    
Non-vested common shares issued 0.0       0.0     0.0     0.0    
Non-vested common shares forfeited or canceled 0.0       0.0     0.0     0.0    
Stock options exercised, net of share tendered in payment of option price and income tax withholding amounts 0.4       0.4     0.0     0.0    
Stock-based compensation expense 5.5       5.5     0.0     0.0    
Common cash dividend declared (50.8)       0.0     (50.8)     0.0    
Equity, ending balance at Jun. 30, 2021 1,970.9       941.6     1,005.2     24.1    
Equity, beginning balance at Mar. 31, 2021 1,933.4       938.5     988.2     6.7    
Increase (Decrease) in Stockholders' Equity [Roll Forward]                          
Net income 42.5       0.0     42.5     0.0    
Other comprehensive income (loss), net of tax expense 17.4       0.0     0.0     17.4    
Common stock transactions:                          
Common shares purchased and retired $ 0.0       0.0     0.0     0.0    
Common shares issued (in shares) 18,477                        
Common shares issued $ 0.0       0.0     0.0     0.0    
Non-vested common shares forfeited or canceled 0.0       0.0     0.0     0.0    
Stock-based compensation expense 3.1       3.1     0.0     0.0    
Common cash dividend declared (25.5)       0.0     (25.5)     0.0    
Equity, ending balance at Jun. 30, 2021 $ 1,970.9       $ 941.6     $ 1,005.2     $ 24.1