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Organization (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Oct. 03, 2019
Jul. 31, 2014
Dec. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Mar. 31, 2018
Segment Reporting Information [Line Items]            
Beginning balance     $ 1.7 $ 0.9    
Restructuring     2.4 3.2    
Payments     0.5 1.1    
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage 51.00% 49.00%        
Defined Benefit Plan, Net Periodic Benefit Cost other than Service Cost     $ (0.7) $ (0.1)    
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent     21.00% 21.00%   35.00%
Payments to Acquire Interest in Joint Venture     $ 2.2 $ 0.0 $ 1.7  
Mueller Co. [Member]            
Segment Reporting Information [Line Items]            
Restructuring     $ 0.0 $ 0.0