Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies Revenue Recognition - Impact on Income Statement (Details)

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Summary of Significant Accounting Policies Revenue Recognition - Impact on Income Statement (Details) - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]    
Net revenue [1] $ 410.3 $ 397.2
Cost of Goods and Services Sold 263.3 251.0
Gross profit 147.0 146.2
Operating expenses 90.7 89.1
Income before income taxes 43.5 42.8
Income tax expense 14.5 23.7
Consolidated net income 29.0 $ 19.1
Difference between Revenue Guidance in Effect before and after Topic 606 [Member]    
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]    
Net revenue (1.0)  
Cost of Goods and Services Sold (0.9)  
Gross profit (0.1)  
Operating expenses 0.0  
Income before income taxes (0.1)  
Income tax expense 0.0  
Consolidated net income (0.1)  
Calculated under Revenue Guidance in Effect before Topic 606 [Member]    
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]    
Net revenue 409.3  
Cost of Goods and Services Sold 262.4  
Gross profit 146.9  
Operating expenses 90.7  
Income before income taxes 43.4  
Income tax expense 14.5  
Consolidated net income $ 28.9  
[1] We attribute revenue to a geography based upon the location of the business unit that consummates the external sale.