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CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY - USD ($)
$ in Millions
Total
Amount
Treasury Stock [Member]
Treasury Stock [Member]
Convertible Notes Due Twenty Twenty One [Member]
Convertible Debt
AOCI Attributable to Parent [Member]
Retained Earnings [Member]
Additional Paid-in Capital [Member]
Additional Paid-in Capital [Member]
Convertible Notes Due Twenty Twenty One [Member]
Convertible Debt
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Common stock, shares issued (in shares)   90,212,779            
Treasury Stock, Shares     0          
Balance at Dec. 31, 2018 $ 1,211.6 $ 0.9 $ 0.0   $ (111.0) $ (224.2) $ 1,545.9  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net earnings 49.1         49.1    
Other Comprehensive Income (Loss), Net of Tax (1.0)       (1.0)      
Exercise of convertible note hedges 25.2           25.2  
Stock Issued During Period, Shares, New Issues   623,951            
Restricted and performance stock unit settlement, net of tax (6.4)           (6.4)  
Exercise of stock options 10.0           10.0  
Restricted Stock, Shares Issued Net of Shares for Tax Withholdings   865,015            
Balance at Dec. 31, 2019 1,288.5 $ 0.9 $ 0.0   (112.0) (175.1) 1,574.7  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Common stock, shares issued (in shares)   91,701,745            
Treasury Stock, Shares     0          
Net earnings 6.6         6.6    
Other Comprehensive Income (Loss), Net of Tax 11.5       11.5      
Stock Repurchased During Period, Value     $ 16.2          
Stock Repurchased During Period, Shares     (1,078,363)          
Exercise of convertible note hedges 17.3           17.3  
Stock Issued During Period, Shares, New Issues   141,336            
Restricted and performance stock unit settlement, net of tax (6.1)           (6.1)  
Exercise of stock options 1.9           1.9  
Restricted Stock, Shares Issued Net of Shares for Tax Withholdings   846,831            
Balance at Dec. 31, 2020 1,303.5 $ 0.9 $ (16.2)   (100.5) (168.5) 1,587.8  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Retained Earnings (Accumulated Deficit) $ (168.5)              
Common stock, shares issued (in shares) 92,689,912 92,689,912            
Treasury Stock, Shares 1,078,363   (1,078,363)          
Net earnings $ 150.4              
Other Comprehensive Income (Loss), Net of Tax 0.1       0.1      
Stock Repurchased During Period, Value     $ 44.5          
Stock Repurchased During Period, Shares     (2,139,413)          
Exercise of convertible note hedges 32.1           32.1  
Stock Issued During Period, Shares, New Issues   1,540,314            
Restricted and performance stock unit settlement, net of tax (7.7)           (7.7)  
Exercise of stock options 25.6 $ 0.1         25.5  
Stock Issued During Period, Value, Conversion of Convertible Securities 0.0   $ 5.9          
Adjustments to Additional Paid in Capital, Convertible Debt with Conversion Feature             (5.9)  
Stock Issued During Period, Shares, Conversion of Convertible Securities     363,579          
Shares received from convertible note hedges       (363,601)        
Exercise of convertible note hedges 0.0     $ (7.6)       $ 7.6
Restricted Stock, Shares Issued Net of Shares for Tax Withholdings   882,552            
Balance at Dec. 31, 2021 1,459.5 $ 1.0 $ (62.4)   $ (100.4) $ (18.1) $ 1,639.4  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Retained Earnings (Accumulated Deficit) $ (18.1)              
Common stock, shares issued (in shares) 95,112,778 95,112,778            
Treasury Stock, Shares 3,217,798   (3,217,798)