XML 26 R49.htm IDEA: XBRL DOCUMENT v3.19.3
Goodwill - Summary of Goodwill (Detail)
$ in Millions
9 Months Ended
Sep. 30, 2019
USD ($)
Goodwill [Line Items]  
Gross cost, beginning balance $ 601.4
Accumulated impairment losses, beginning balance (236.5)
Net book amount, beginning balance 364.9
Exchange effect (4.4)
Gross cost, ending balance 597.0
Accumulated impairment losses, ending balance (236.5)
Net book amount, ending balance $ 360.5