Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Other (Details)

v3.10.0.1
Summary of Significant Accounting Policies - Other (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Jan. 01, 2018
Dec. 31, 2017
Feb. 23, 2017
Jul. 24, 2008
FederalCorporateTaxRate       21.00% 35.00%    
BlendedCorporateTaxRate 24.50%            
Treasury Stock              
Maximum amount of common stock repurchases $ 200.0         $ 100.0 $ 100.0
Shares Repurchased And Classified As Treasury Stock Value (Aggregate) $ 160.4            
Shares Repurchased (Aggregate) 4,950,000            
Shares Repurchased and Classified as Treasury Stock (shares) 1,385,600            
Shares repurchased (in dollars) $ 61.0 $ 28.0 $ 21.2        
Shares issued from treasury stock under various stock compensation programs (in shares) 500,000 700,000          
Remaining amount of share repurchases $ 39.6            
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 $ (44.1) $ (36.9)          
Pension and postretirement (net of taxes of $22.3 and $23.4) (41.0) (45.3)          
Unrealized gain (loss) on derivative instruments (net of taxes of $0.3 and $0.8) 0.9 1.0          
Accumulated other comprehensive loss (84.2) (81.2)          
Pension and postretirement, taxes 22.3 23.4          
Unrealized gain (loss) on derivative instruments, taxes $ 0.3 $ 0.8          
Revenue recognition              
Revenue from long-term manufacturing contracts as a percentage of total revenue 25.00% 25.00% 24.00%        
Research and Development Costs              
Research and development costs $ 11.7 $ 11.9 $ 12.6        
Warranty costs              
Warranty reserves 16.9 15.8          
Warranty costs 3.3 4.1 4.3        
Recently Adopted Accounting Standards              
Income tax expense 65.3 59.9 $ 47.3        
Cash Flow Hedging | Foreign Exchange Forward              
Derivative instruments and hedging activity              
Aggregate notional value of derivatives $ 152.6 262.4          
Minimum              
Standard Product Warranty Period 1 year            
Maximum              
Standard Product Warranty Period 2 years            
Self-Insurance              
Deductibles and self-insured retentions per occurrence $ 0.5            
Derivative instruments and hedging activity              
Term of foreign currency exchange forward contracts 24 months            
Business acquisitions and related business acquisition and transition costs              
Measurement period over which initial purchase price allocations are subject to revision 1 year            
Carrying Value              
Derivative instruments and hedging activity              
Derivative Asset $ 1.9 3.8          
Derivative Liability $ 2.2 $ 2.3