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Consolidated Statement Of Stockholders' Equity - USD ($)
$ in Millions
Total
Common stock
Accumulated deficit
Accumulated other comprehensive income (loss)
Noncontrolling Interest [Member]
Additional Paid-in Capital [Member]
Other Comprehensive Income (Loss), Net of Tax       $ 0.9    
Common Stock, Dividends, Per Share, Declared $ 0.14          
Balance at Sep. 30, 2017   $ 1.6 $ (955.6) (51.8) $ 1.1 $ 1,494.2
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Dividends declared           22.2
Stock repurchased under buyback program           (20.0)
Stock-based compensation           4.3
Shares retained for employee taxes           2.1
Stock issued under stock compensation plans $ 0.0         6.9
Net Income (Loss) Attributable to Parent 80.6          
Net Income (Loss) Attributable to Noncontrolling Interest         (0.2)  
Balance at Jun. 30, 2018 $ 538.1 1.6 (875.0) (50.9) 1.3 1,461.1
Other Comprehensive Income (Loss), Net of Tax       (2.5)    
Common Stock, Dividends, Per Share, Declared $ 0.05          
Balance at Mar. 31, 2018   1.6 (890.3) (48.4) 1.2 1,467.7
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Dividends declared           7.9
Stock repurchased under buyback program           0.0
Stock-based compensation           0.8
Shares retained for employee taxes           0.0
Stock issued under stock compensation plans $ 0.0         0.5
Net Income (Loss) Attributable to Parent 15.3          
Net Income (Loss) Attributable to Noncontrolling Interest         (0.1)  
Balance at Jun. 30, 2018 538.1 1.6 (875.0) (50.9) 1.3 1,461.1
Common Stock, Value, Issued 1.6          
Other Comprehensive Income (Loss), Net of Tax $ 5.7     5.7    
Common Stock, Dividends, Per Share, Declared $ 0.15          
Balance at Sep. 30, 2018 $ 564.8 1.6 (850.0) (32.8) 1.5 1,444.5
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Dividends declared           23.7
Stock repurchased under buyback program           (10.0)
Stock-based compensation           3.4
Shares retained for employee taxes           1.4
Stock issued under stock compensation plans 0.0         4.1
Net Income (Loss) Attributable to Parent 23.6          
Net Income (Loss) Attributable to Noncontrolling Interest         (0.5)  
Balance at Jun. 30, 2019 $ 567.0 1.6 (826.4) (27.1) 2.0 1,416.9
Other Comprehensive Income (Loss), Net of Tax       0.7    
Common Stock, Dividends, Per Share, Declared $ 0.05          
Balance at Mar. 31, 2019   1.6 (860.1) (27.8) 1.9 1,433.2
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Dividends declared           7.9
Stock repurchased under buyback program           (10.0)
Stock-based compensation           1.1
Shares retained for employee taxes           0.0
Stock issued under stock compensation plans $ 0.0         0.5
Net Income (Loss) Attributable to Parent 33.7          
Net Income (Loss) Attributable to Noncontrolling Interest         (0.1)  
Balance at Jun. 30, 2019 567.0 $ 1.6 $ (826.4) $ (27.1) $ 2.0 $ 1,416.9
Common Stock, Value, Issued $ 1.6