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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         $ 1.7    
Common stock, dividends, per share, declared $ 0.1575            
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             24.9
Stock-based compensation             3.8
Shares retained for employee taxes             0.7
Stock issued under stock compensation plans $ 0.0           2.6
Net income (loss) 45.3            
Balance at Jun. 30, 2020   1.6 (740.9)   (34.3) 0.0 1,383.3
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         (1.2)    
Common stock, dividends, per share, declared $ 0.0525            
Balance at Mar. 31, 2020   1.6 (752.1)   (33.1) 0.0 1,390.1
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Dividends declared             8.3
Stock-based compensation             1.1
Shares retained for employee taxes             0.0
Stock issued under stock compensation plans $ 0.0           0.4
Net income (loss) 11.2            
Balance at Jun. 30, 2020   1.6 (740.9)   (34.3) 0.0 1,383.3
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             0.0
Stockholders' Equity Attributable to Parent 609.7     $ 0.0      
Common stock, value, issued 1.6            
Other comprehensive income (loss), net of tax $ 9.9       9.9    
Common stock, dividends, per share, declared $ 0.1650            
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             26.1
Stock-based compensation             6.3
Shares retained for employee taxes             1.0
Stock issued under stock compensation plans 0.0           1.5
Net income (loss) 52.0            
Balance at Jun. 30, 2021 683.2 1.6 (662.3)   (14.8) 0.0 1,358.7
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         4.9    
Common stock, dividends, per share, declared $ 0.0550            
Balance at Mar. 31, 2021   1.6 (676.7)   (19.7) 0.0 1,364.2
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Dividends declared             8.7
Stock-based compensation             2.7
Shares retained for employee taxes             0.0
Stock issued under stock compensation plans $ 0.0           0.5
Net income (loss) 14.4            
Balance at Jun. 30, 2021 683.2 $ 1.6 $ (662.3)   $ (14.8) 0.0 1,358.7
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 $ 683.2     $ 0.0