XML 91 R43.htm IDEA: XBRL DOCUMENT v3.20.1
Net Income Per Share - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended
Sep. 17, 2018
Mar. 31, 2020
Mar. 31, 2019
Earnings Per Share [Abstract]      
Dividends declared per share, in dollars per share   $ 0.75 $ 0.73
Tangible equity units issued 16,500,000    
Tangible equity units proceeds $ 800.2    
Price for basic share (usd per share) $ 0.3134    
Tangible Equity Units, Price for Shares Diluted $ 0.3839    
Net income allocated to PRS   $ 0.2 $ 0.2