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Summary of Significant Accounting Policies (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Oct. 01, 2019
Sep. 30, 2019
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]      
Receivables from long-term manufacturing contracts $ 166.2   $ 181.1
Inventories, net 424.3   176.6
Deferred Income Tax Liabilities, Net 187.6   73.6
Retained earnings 504.4   599.5
Operating lease right-of-use assets 161.4   $ 0.0
Total present value of lease payments $ 158.9    
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