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Organization (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Jul. 31, 2014
Dec. 31, 2017
Dec. 31, 2016
Sep. 30, 2019
Sep. 30, 2017
Segment Reporting Information [Line Items]          
Beginning balance   $ 3.3      
Restructuring   3.9 $ 1.3    
Payments   $ 1.4      
Number of Reportable Segments   2      
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage 49.00%        
Defined Benefit Plan, Net Periodic Benefit Cost other than Service Cost   $ 0.2 0.3    
Revenue, Net   $ 178.3 $ 167.2    
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent   24.50% 35.00%   35.00%
Mueller Co. [Member]          
Segment Reporting Information [Line Items]          
Restructuring   $ 0.0 $ 0.1    
Revenue, Net   160.1 146.3    
General and Administrative Expense [Member] | Mueller Co. [Member]          
Segment Reporting Information [Line Items]          
Defined Benefit Plan, Net Periodic Benefit Cost other than Service Cost     0.2    
Cost of Sales [Member] | Mueller Co. [Member]          
Segment Reporting Information [Line Items]          
Defined Benefit Plan, Net Periodic Benefit Cost other than Service Cost     $ 0.1    
Product [Member]          
Segment Reporting Information [Line Items]          
Revenue, Net   $ 3.7      
Scenario, Forecast [Member]          
Segment Reporting Information [Line Items]          
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent       21.00%