Quarterly report pursuant to Section 13 or 15(d)

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

v3.19.1
Summary of Significant Accounting Policies Revenue Recognition - Impact on Income Statement (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Net revenue $ 464.6 [1] $ 452.2 [1] $ 874.9 $ 849.4
Cost of Goods and Services Sold 303.7 283.6 567.0 534.6
Gross profit 160.9 168.6 307.9 314.8
Operating expenses 93.7 98.3 184.4 187.4
Income before income taxes 53.3 (7.7) 96.8 35.1
Income tax expense 13.8 13.6 28.3 37.3
Consolidated net income (loss) 39.5 $ (21.3) 68.5 $ (2.2)
Difference between Revenue Guidance in Effect before and after Topic 606 [Member]        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Net revenue (0.1)   (1.1)  
Cost of Goods and Services Sold (0.1)   (1.0)  
Gross profit 0.0   (0.1)  
Operating expenses 0.0   0.0  
Income before income taxes 0.0   (0.1)  
Income tax expense 0.0   0.0  
Consolidated net income (loss) 0.0   (0.1)  
Calculated under Revenue Guidance in Effect before Topic 606 [Member]        
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Net revenue 464.5   873.8  
Cost of Goods and Services Sold 303.6   566.0  
Gross profit 160.9   307.8  
Operating expenses 93.7   184.4  
Income before income taxes 53.3   96.7  
Income tax expense 13.8   28.3  
Consolidated net income (loss) $ 39.5   $ 68.4  
[1] We attribute revenue to a geography based upon the location of the business unit that consummates the external sale.