Quarterly report pursuant to Section 13 or 15(d)

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

v3.20.4
Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Sep. 30, 2020
Oct. 01, 2019
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Receivables from long-term manufacturing contracts $ 158.9 $ 138.1  
Inventories, net 388.5 385.4  
Deferred Income Tax Liabilities, Net 204.7 185.8  
Retained earnings 541.4 481.4  
Operating lease right-of-use assets 153.0 154.4  
Total present value of lease payments $ 151.0 $ 152.1  
Retained Earnings [Member] | Accounting Standards Update 2018-02 [Member]      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Cumulative effect of new accounting principle     $ 6.0
AOCI Attributable to Parent [Member] | Accounting Standards Update 2018-02 [Member]      
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Cumulative effect of new accounting principle     $ 6.0