XML 163 R143.htm IDEA: XBRL DOCUMENT v3.19.1
POST REPORTING EVENTS (Details) - USD ($)
$ / shares in Units, $ in Millions
Mar. 12, 2019
Dec. 14, 2018
Sep. 14, 2018
Jun. 15, 2018
Mar. 20, 2018
Dec. 15, 2017
Sep. 15, 2017
Jun. 15, 2017
Mar. 21, 2017
Dec. 15, 2016
Sep. 15, 2016
Jun. 15, 2016
Mar. 21, 2016
Disclosure of non-adjusting events after reporting period [line items]                          
Number of shares issued (in shares)   58,867,410 58,817,410 58,817,410 58,807,410 58,799,910 59,036,310 59,169,710 59,110,335 59,060,335 58,621,585 58,602,835 58,522,835
Major ordinary share transactions                          
Disclosure of non-adjusting events after reporting period [line items]                          
Cash dividends declared (in US dollars per share) $ 0.14                        
Estimated amount of dividend payment $ 8.2                        
Number of shares issued (in shares) 58,650,310