Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Details)

v3.10.0.1
Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Oct. 01, 2018
Sep. 30, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Receivables from long-term manufacturing contracts $ 134.2 $ 122.2 $ 120.3
Inventories 182.3 170.9 172.5
Deferred income taxes 77.7 76.5 76.4
Retained earnings 546.3 531.2 531.0
Difference between Revenue Guidance in Effect before and after Topic 606 [Member]      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Receivables from long-term manufacturing contracts (2.0) 1.9  
Inventories 1.9 (1.6)  
Deferred income taxes   0.1  
Retained earnings (0.1) $ 0.2  
Calculated under Revenue Guidance in Effect before Topic 606 [Member]      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Receivables from long-term manufacturing contracts 132.2   120.3
Inventories 184.2   172.5
Deferred income taxes     76.4
Retained earnings $ 546.2   $ 531.0