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Benefit Plans - Savings Plan (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Annual eligible compensation percentage 1.50%    
Other accrued retirement compensation $ 28.2 $ 29.6  
First 1%      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Matching contribution to eligible employee contributions 100.00% 100.00%  
Percent of eligible compensation   1.00%  
Next 5%      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Matching contribution to eligible employee contributions   50.00%  
Percent of eligible compensation 5.00% 5.00%  
Flow 401(K) Plan      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
401(k) plan and ESOP combined expenses $ 23.4 $ 27.9 $ 27.1