Other (expense) income, net (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Other Income and Expenses [Abstract]
Net foreign exchange transaction (loss) gain	$ (1.4)	$ (1.5)	$ 5.2	$ (4.1)
Bank fee expense	(1.1)	(1.1)	(3.4)	(3.6)
Pension (expense) income other than service costs	(0.1)	0.2	1.1	1.1
Other, net	1.4	0.5	5.0	7.9
Other (expense) income, net	$ (1.2)	$ (1.9)	$ 7.9	$ 1.3