Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Other (Details)

v3.21.2
Summary of Significant Accounting Policies - Other (Details) - USD ($)
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Oct. 01, 2019
Total operating lease liabilities $ 136,300,000 $ 152,100,000    
Treasury Stock        
Maximum amount of common stock repurchases 200,000,000.0      
Remaining amount of share repurchases $ 78,900,000      
Shares Repurchased and Classified as Treasury Stock (shares)   2,792,205    
Shares repurchased (in dollars)   $ 121,100,000    
Shares issued from treasury stock under various stock compensation programs (in shares) 700,000 200,000 400,000  
Preferred stock        
Authorized shares of preferred stock (in shares) 1,000,000      
Preferred stock par value (in dollars per share) $ 0 $ 0    
Shares issued 0 0    
Accumulated other comprehensive loss        
Currency translation $ 13,100,000 $ (21,100,000)    
Pension and postretirement (net of taxes of $17.8 and $24.2) (49,200,000) (69,600,000)    
Unrealized loss on derivative instruments (net of taxes of $0.7 and $0.7) (10,200,000) (12,100,000)    
Accumulated other comprehensive loss (46,300,000) (102,800,000)    
Pension and postretirement, taxes 24,200,000 30,000,000.0    
Unrealized gain (loss) on derivative instruments, taxes 700,000 700,000    
Research and Development Costs        
Research and development costs 21,400,000 18,600,000 $ 10,600,000  
Warranty costs        
Warranty reserves 24,200,000 23,800,000    
Warranty costs 13,300,000 12,600,000 3,400,000  
Recently Adopted Accounting Standards        
Income tax expense $ 98,600,000 34,900,000 $ 50,500,000  
Minimum        
Warranty costs        
Standard Product Warranty Period 1 year      
Maximum        
Length of Time Hedged in Currency Exchange Rates 24 months      
Self-Insurance        
Deductibles and self-insured retentions per occurrence $ 500,000      
Warranty costs        
Standard Product Warranty Period 2 years      
Business acquisitions and related business acquisition and transition costs        
Measurement period over which initial purchase price allocations are subject to revision 1 year      
Previously Reported [Member]        
Treasury Stock        
Remaining amount of share repurchases   39,600,000    
Accounting Standards Update 2016-02 [Member]        
Recently Adopted Accounting Standards        
Operating lease right-of-use assets $ 138,100,000 $ 154,400,000    
Accounting Standards Update 2018-02 [Member] | Retained Earnings        
Recently Adopted Accounting Standards        
Reclassification of certain income tax effects       $ 600,000