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Organization (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Oct. 03, 2019
Jul. 31, 2014
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Sep. 30, 2014
Segment Reporting Information [Line Items]              
Beginning balance         $ 1.7 $ 0.9  
Restructuring     $ 0.9 $ 6.9 3.3 10.1  
Payments         2.7 2.6  
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage 51.00% 49.00%          
Defined Benefit Plan, Net Periodic Benefit Cost other than Service Cost     $ (0.8) $ 1.0 $ (1.5) $ 0.9  
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent     21.00% 21.00% 21.00% 21.00%  
Payments to Acquire Interest in Joint Venture             $ 1.7
Mueller Co. [Member]              
Segment Reporting Information [Line Items]              
Restructuring     $ 0.4 $ 1.1 $ 0.4 $ 1.1