Quarterly report pursuant to Section 13 or 15(d)

Other Comprehensive Income (Loss) - Schedule of changes in accumulated other comprehensive income (loss) (Details)

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Other Comprehensive Income (Loss) - Schedule of changes in accumulated other comprehensive income (loss) (Details) - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Oct. 01, 2019
Accumulated Other Comprehensive Income (Loss), before Tax [Roll Forward]      
Balance at the beginning of the period $ (140.6)    
Other comprehensive income before reclassifications      
Before tax amount 18.6 $ (11.7)  
Tax benefit (0.3) 1.6  
After tax amount 18.3 (10.1)  
Amounts reclassified from accumulated other comprehensive loss(1) 1.5 0.2  
Total changes in other comprehensive income (loss), net of tax 19.8 (9.9)  
Reclassification of certain income tax effects     $ 0.0
Balance at the end of the period (126.7)    
Pension and Postretirement      
Accumulated Other Comprehensive Income (Loss), before Tax [Roll Forward]      
Balance at the beginning of the period (62.3) (41.0)  
Other comprehensive income before reclassifications      
Before tax amount 0.0 0.0  
Tax benefit 0.0 0.0  
After tax amount 0.0 0.0  
Amounts reclassified from accumulated other comprehensive loss(1) 1.1 0.2  
Total changes in other comprehensive income (loss), net of tax 1.1 0.2  
Reclassification of certain income tax effects     (6.0)
Balance at the end of the period (67.2) (40.8)  
Currency Translation      
Accumulated Other Comprehensive Income (Loss), before Tax [Roll Forward]      
Balance at the beginning of the period (64.7) (44.1)  
Other comprehensive income before reclassifications      
Before tax amount 17.4 (5.1)  
Tax benefit 0.0 0.0  
After tax amount 17.4 (5.1)  
Amounts reclassified from accumulated other comprehensive loss(1) 0.0 0.0  
Total changes in other comprehensive income (loss), net of tax 17.4 (5.1)  
Reclassification of certain income tax effects     0.0
Balance at the end of the period (47.3) (49.2)  
Net Unrealized Gain (Loss) on Derivative Instruments      
Accumulated Other Comprehensive Income (Loss), before Tax [Roll Forward]      
Balance at the beginning of the period (13.6) 0.9  
Other comprehensive income before reclassifications      
Before tax amount 1.3 (6.8)  
Tax benefit (0.3) 1.6  
After tax amount 1.0 (5.2)  
Amounts reclassified from accumulated other comprehensive loss(1) 0.4 0.0  
Total changes in other comprehensive income (loss), net of tax 1.4 (5.2)  
Reclassification of certain income tax effects     0.0
Balance at the end of the period (12.2) (4.3)  
Total Attributable to Hillenbrand, Inc.      
Accumulated Other Comprehensive Income (Loss), before Tax [Roll Forward]      
Balance at the beginning of the period (140.6) (84.2)  
Other comprehensive income before reclassifications      
Before tax amount 18.7 (11.9)  
Tax benefit (0.3) 1.6  
After tax amount 18.4 (10.3)  
Amounts reclassified from accumulated other comprehensive loss(1) 1.5 0.2  
Total changes in other comprehensive income (loss), net of tax 19.9 (10.1)  
Reclassification of certain income tax effects     $ (6.0)
Balance at the end of the period (126.7) (94.3)  
Noncontrolling Interests      
Other comprehensive income before reclassifications      
Before tax amount (0.1) 0.2  
Tax benefit 0.0 0.0  
After tax amount (0.1) 0.2  
Amounts reclassified from accumulated other comprehensive loss(1) 0.0 0.0  
Total changes in other comprehensive income (loss), net of tax $ (0.1) $ 0.2