Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Other (Details)

v3.20.2
Summary of Significant Accounting Policies - Other (Details) - USD ($)
 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Nov. 21, 2019
Oct. 01, 2019
Sep. 30, 2019
Sep. 30, 2019
Total operating lease liabilities $ 152,100,000            
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification [1] 0            
Treasury Stock              
Maximum amount of common stock repurchases 200,000,000.0            
Remaining amount of share repurchases $ 200,000,000.0            
Shares Repurchased and Classified as Treasury Stock (shares)   1,385,600          
Shares repurchased (in dollars)   $ 61,000,000.0 $ 61,000,000.0        
Shares issued from treasury stock under various stock compensation programs (in shares) 200,000 400,000 500,000        
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 $ (21,100,000)           $ (64,700,000)
Pension and postretirement (net of taxes of $24.2 and $30.0) (69,600,000)           (62,300,000)
Unrealized loss on derivative instruments (net of taxes of $0.7 and $0.7) (12,100,000)           (13,600,000)
Accumulated other comprehensive loss (102,800,000)           (140,600,000)
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 18,600,000 $ 10,600,000 $ 11,700,000        
Warranty costs              
Warranty reserves 23,800,000     $ 8,500,000     16,300,000
Warranty costs 4,500,000 3,400,000 3,300,000        
Recently Adopted Accounting Standards              
Income tax expense 34,900,000 50,500,000 $ 65,300,000        
Accumulated Other Comprehensive Loss              
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification [1] 6,000,000.0            
Retained Earnings              
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification [1] $ (6,000,000.0)            
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]              
Total operating lease liabilities $ 152,100,000            
Recently Adopted Accounting Standards              
Operating lease right-of-use assets $ 154,400,000            
Accounting Standards Update 2018-02 [Member] | Accumulated Other Comprehensive Loss              
Recently Adopted Accounting Standards              
Reclassification of certain income tax effects         $ 6,000,000.0    
Accounting Standards Update 2018-02 [Member] | Retained Earnings              
Recently Adopted Accounting Standards              
Reclassification of certain income tax effects         $ 600,000    
Cost of Goods and Service Benchmark [Member] | Accounting Standards Update 2017-07 [Member]              
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification   $ 800,000          
[1] Income tax effects of the Tax Act (as defined in Note 2) were reclassified from accumulated other comprehensive loss to retained earnings due to the adoption of ASU 2018-02. See Note 2 for more information.