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Net Income Per Share (TEU) (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
Sep. 17, 2018
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Earnings Per Share [Abstract]          
Tangible equity units issued 16,500,000        
Tangible equity units proceeds $ 800.2        
Price for basic share (usd per share) $ 0.3134        
Price for shares diluted (usd per share) $ 0.3408        
Difference amount between basic and diluted net income per share   $ 0.01 $ 0.01    
Net income allocated to PRS   $ 0.2 $ 0.2 $ 0.3 $ 0.5