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Consolidated Statement Of Stockholders' Equity - USD ($)
$ in Millions
Total
Common stock
Accumulated deficit
Accumulated deficit
Cumulative Effect, Period of Adoption, Adjustment
Accumulated other comprehensive income (loss)
Additional Paid-in Capital [Member]
Other comprehensive income (loss), net of tax         $ 5.0  
Common stock, dividends, per share, declared $ 0.110          
Balance at Sep. 30, 2020   $ 1.6 $ (714.2)   (24.7) $ 1,378.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Dividends declared           17.4
Stock-based compensation           3.6
Shares retained for employee taxes           1.0
Stock repurchased under buyback program           0.0
Stock issued under stock compensation plans $ 0.0         1.0
Net income (loss) $ 37.6          
Balance at Mar. 31, 2021   1.6 (676.7)   (19.7) 1,364.2
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stockholders' Equity Attributable to Parent       $ (0.1)    
Other comprehensive income (loss), net of tax         0.0  
Common stock, dividends, per share, declared $ 0.055          
Balance at Dec. 31, 2020   1.6 (697.6)   (19.7) 1,370.9
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Dividends declared           8.7
Stock-based compensation           1.7
Shares retained for employee taxes           0.1
Stock repurchased under buyback program           0.0
Stock issued under stock compensation plans $ 0.0         0.4
Net income (loss) 20.9          
Balance at Mar. 31, 2021   1.6 (676.7)   (19.7) 1,364.2
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stockholders' Equity Attributable to Parent 669.4     0.0    
Common stock, value, issued 1.6          
Other comprehensive income (loss), net of tax $ 2.8       2.8  
Common stock, dividends, per share, declared $ 0.116          
Balance at Sep. 30, 2021 $ 694.9 1.6 (643.9)   (5.0) 1,342.2
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Dividends declared           18.3
Stock-based compensation           4.4
Shares retained for employee taxes           1.8
Stock repurchased under buyback program           (20.0)
Stock issued under stock compensation plans 0.0         1.1
Net income (loss) 43.0          
Balance at Mar. 31, 2022 $ 706.1 1.6 (600.9)   (2.2)  
Other comprehensive income (loss), net of tax         (3.2)  
Common stock, dividends, per share, declared $ 0.058          
Balance at Dec. 31, 2021   1.6 (624.5)   1.0 1,313.8
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Dividends declared           9.1
Stock-based compensation           2.4
Shares retained for employee taxes           (0.1)
Stock repurchased under buyback program           0.0
Stock issued under stock compensation plans $ 0.0         $ 0.4
Net income (loss) 23.6          
Balance at Mar. 31, 2022 706.1 $ 1.6 $ (600.9)   $ (2.2)  
Common stock, value, issued 1.6          
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Stockholders' Equity Attributable to Parent $ 706.1     $ 0.0