Other Intangible Assets - Summary of Other Intangible Assets (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Gross cost at January 1	$ 294.8
Exchange effect	(0.9)
Gross cost at March 31	293.9
Accumulated amortization at January 1	(181.3)
Amortization expense	(5.8)	$ (5.7)
Exchange effect	0.3
Accumulated amortization at March 31	(186.8)
Net book amount at March 31	$ 107.1		$ 113.5