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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)
Noncontrolling Interest [Member]
Additional Paid-in Capital [Member]
Other comprehensive income (loss), net of tax         $ 2.9    
Common stock, dividends, per share, declared $ 0.1050            
Balance at Sep. 30, 2019   $ 1.6 $ (786.2)   (36.0) $ 2.2 $ 1,410.7
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Dividends declared             16.6
Stock-based compensation             2.7
Shares retained for employee taxes             0.7
Stock issued under stock compensation plans $ 0.0           2.2
Net income (loss) 34.1            
Balance at Mar. 31, 2020   1.6 (752.1)   (33.1) 0.0 1,390.1
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Proceeds from (Payments to) Noncontrolling Interests           (2.2)  
Adjustments to Additional paid in capital, other             (3.2)
Acquisition of joint venture partner's interest $ 5.2            
Stock repurchased under buyback program             (5.0)
Other comprehensive income (loss), net of tax         (1.1)    
Common stock, dividends, per share, declared $ 0.0525            
Balance at Dec. 31, 2019   1.6 (775.9)   (32.0) 0.0 1,401.3
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Dividends declared             8.3
Stock-based compensation             1.3
Shares retained for employee taxes             0.0
Stock issued under stock compensation plans $ 0.0           0.8
Net income (loss) 23.8            
Balance at Mar. 31, 2020   1.6 (752.1)   (33.1) 0.0 1,390.1
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Proceeds from (Payments to) Noncontrolling Interests           0.0  
Adjustments to Additional paid in capital, other             0.0
Stock repurchased under buyback program             (5.0)
Stockholders' Equity Attributable to Parent 606.5     $ 0.0      
Common stock, value, issued 1.6            
Other comprehensive income (loss), net of tax $ 5.0       5.0    
Common stock, dividends, per share, declared $ 0.1100            
Balance at Sep. 30, 2020 $ 640.7 1.6 (714.2)   (24.7) 0.0 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 issued under stock compensation plans 0.0           1.0
Net income (loss) 37.6            
Balance at Mar. 31, 2021 669.4 1.6 (676.7)   (19.7) 0.0 1,364.2
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Proceeds from (Payments to) Noncontrolling Interests           0.0  
Adjustments to Additional paid in capital, other             0.0
Acquisition of joint venture partner's interest $ 0.0            
Stock repurchased under buyback program             0.0
Stockholders' Equity Attributable to Parent       (0.1)      
Other comprehensive income (loss), net of tax         0.0    
Common stock, dividends, per share, declared $ 0.0550            
Balance at Dec. 31, 2020   1.6 (697.6)   (19.7) 0.0 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 issued under stock compensation plans $ 0.0           0.4
Net income (loss) 20.9            
Balance at Mar. 31, 2021 669.4 $ 1.6 $ (676.7)   $ (19.7) 0.0 1,364.2
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Adjustments to Additional paid in capital, other             0.0
Noncontrolling interest, decrease from distributions to noncontrolling interest holders           $ 0.0  
Stock repurchased under buyback program             $ 0.0
Common stock, value, issued 1.6            
Stockholders' Equity Attributable to Parent $ 669.4     $ 0.0