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Statement of Consolidated Stockholders' Equity (Unaudited) - USD ($)
$ in Millions
Total
Common Stock
Additional Paid in Capital
Retained Earnings
Treasury Stock
Accumulated Other Comprehensive Loss
Stockholders' Equity [Roll Forward]            
Cumulative-effect adjustment $ 10.1     $ 10.5 $ 0.0 $ (0.4)
Adjusted balance 756.4 $ 0.2 $ 1,055.9 96.0 (358.6) (37.1)
Beginning balance (shares) at Dec. 31, 2017   16,773,586        
Beginning balance at Dec. 31, 2017 746.3 $ 0.2 1,055.9 85.5 (358.6) (36.7)
Stockholders' Equity [Roll Forward]            
Net income 25.7     25.7    
Other comprehensive income (loss), net of tax (8.3)         (8.3)
Issuance of common shares to employees upon vesting of restricted stock units and performance shares (shares)   135,134        
Cancellation of shares to cover employees' tax withholdings upon vesting of non-vested shares (shares)   (68,029)        
Cancellation of shares to cover employees' tax withholdings upon vesting of non-vested shares (6.9)   (6.9)      
Repurchase of common stock (shares)   (58,155)        
Repurchase of common stock1 (6.1)       (6.1)  
Cash dividends on common stock and restricted shares and dividend equivalents on restricted stock units and performance shares2 [1] (10.0)     (10.0)    
Amortization of unearned equity compensation 2.8   2.8      
Ending balance (shares) at Mar. 31, 2018   16,782,536        
Ending balance at Mar. 31, 2018 $ 753.6 $ 0.2 1,051.8 111.7 (364.7) (45.4)
Stockholders' Equity [Roll Forward]            
Cash dividends declared (in dollars per share) $ 0.55          
Treasury Stock Acquired, Average Cost Per Share $ 104.50          
Beginning balance (shares) at Dec. 31, 2017   16,773,586        
Beginning balance at Dec. 31, 2017 $ 746.3 $ 0.2 1,055.9 85.5 (358.6) (36.7)
Stockholders' Equity [Roll Forward]            
Net income 46.4          
Ending balance (shares) at Jun. 30, 2018   16,665,941        
Ending balance at Jun. 30, 2018 761.0 $ 0.2 1,054.7 123.1 (378.0) (39.0)
Beginning balance (shares) at Mar. 31, 2018   16,782,536        
Beginning balance at Mar. 31, 2018 753.6 $ 0.2 1,051.8 111.7 (364.7) (45.4)
Stockholders' Equity [Roll Forward]            
Net income 20.7     20.7    
Other comprehensive income (loss), net of tax 6.4         6.4
Issuance of non-vested shares to non-employee directors (shares)   9,009        
Issuance of common shares to non-employee directors (shares)   1,954        
Issuance of common shares to non-employee directors 0.2   0.2      
Issuance of common shares to employees upon vesting of restricted stock units and performance shares (shares)   82        
Cancellation of shares to cover employees' tax withholdings upon vesting of non-vested shares (shares)   (95)        
Repurchase of common stock (shares) [2]   (127,545)        
Repurchase of common stock1 [2] (13.3)       (13.3)  
Cash dividends on common stock and restricted shares and dividend equivalents on restricted stock units and performance shares2 [1] (9.3)     (9.3)    
Amortization of unearned equity compensation 2.7   2.7      
Ending balance (shares) at Jun. 30, 2018   16,665,941        
Ending balance at Jun. 30, 2018 $ 761.0 $ 0.2 1,054.7 123.1 (378.0) (39.0)
Stockholders' Equity [Roll Forward]            
Treasury Stock Acquired, Average Cost Per Share $ 104.74          
Beginning balance (shares) at Dec. 31, 2018 16,234,603 16,234,603        
Beginning balance at Dec. 31, 2018 $ 740.4 $ 0.2 1,059.3 150.2 (420.5) (48.8)
Stockholders' Equity [Roll Forward]            
Net income 28.0     28.0    
Other comprehensive income (loss), net of tax 9.7         9.7
Issuance of common shares to employees upon vesting of restricted stock units and performance shares (shares)   122,309        
Cancellation of shares to cover employees' tax withholdings upon vesting of non-vested shares (shares)   (46,388)        
Cancellation of shares to cover employees' tax withholdings upon vesting of non-vested shares (5.0)   (5.0)      
Repurchase of common stock (shares)   (175,977)        
Repurchase of common stock1 (17.4)       (17.4)  
Cash dividends on common stock and restricted shares and dividend equivalents on restricted stock units and performance shares2 (10.2)     (10.2)    
Amortization of unearned equity compensation 2.4   2.4      
Ending balance (shares) at Mar. 31, 2019   16,134,547        
Ending balance at Mar. 31, 2019 $ 747.9 $ 0.2 1,056.7 168.0 (437.9) (39.1)
Stockholders' Equity [Roll Forward]            
Cash dividends declared (in dollars per share) $ 0.60          
Treasury Stock Acquired, Average Cost Per Share $ 98.55          
Beginning balance (shares) at Dec. 31, 2018 16,234,603 16,234,603        
Beginning balance at Dec. 31, 2018 $ 740.4 $ 0.2 1,059.3 150.2 (420.5) (48.8)
Stockholders' Equity [Roll Forward]            
Net income $ 47.2          
Ending balance (shares) at Jun. 30, 2019 16,028,675 16,028,675        
Ending balance at Jun. 30, 2019 $ 746.3 $ 0.2 1,059.2 177.3 (448.1) (42.3)
Beginning balance (shares) at Mar. 31, 2019   16,134,547        
Beginning balance at Mar. 31, 2019 747.9 $ 0.2 1,056.7 168.0 (437.9) (39.1)
Stockholders' Equity [Roll Forward]            
Net income 19.2     19.2    
Other comprehensive income (loss), net of tax (3.2)         (3.2)
Issuance of non-vested shares to non-employee directors (shares)   11,850        
Issuance of common shares to non-employee directors (shares)   2,850        
Issuance of common shares to non-employee directors 0.3   0.3      
Cancellation of shares to cover employees' tax withholdings upon vesting of non-vested shares (shares)   (12,395)        
Cancellation of shares to cover employees' tax withholdings upon vesting of non-vested shares (1.2)   (1.2)      
Repurchase of common stock (shares) [3]   (108,177)        
Repurchase of common stock1 [3] (10.2)       (10.2)  
Cash dividends on common stock and restricted shares and dividend equivalents on restricted stock units and performance shares2 [4] (9.9)     (9.9)    
Amortization of unearned equity compensation $ 3.4   3.4      
Ending balance (shares) at Jun. 30, 2019 16,028,675 16,028,675        
Ending balance at Jun. 30, 2019 $ 746.3 $ 0.2 $ 1,059.2 $ 177.3 $ (448.1) $ (42.3)
Stockholders' Equity [Roll Forward]            
Treasury Stock Acquired, Average Cost Per Share $ 95.00          
Stock Repurchase Program, Remaining Authorized Repurchase Amount $ 121.0          
[1]
Dividends declared per common share were $0.55 during each of the quarters ended March 31, 2018 and June 30, 2018.
[2]
Weighted-average repurchase price (dollars per share) for the quarters ended March 31, 2018 and June 30, 2018 was $104.50 and $104.74, respectively.
[3]
Weighted-average repurchase price (dollars per share) for the quarters ended March 31, 2019 and June 30, 2019 was $98.55 and $95.00, respectively. At June 30, 2019, $121.0 million remained available to repurchase our common shares pursuant to the stock repurchase program.
[4]
Dividends declared per common share were $0.60 during each of the quarters ended March 31, 2019 and June 30, 2019.