Other Income (Expense), net - (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Other Income and Expenses [Abstract]
Net foreign exchange transaction gain (loss)	$ 1.7	$ (7.7)	$ (16.7)
Bank fee expense	(6.3)	(5.0)	(4.4)
Pension income other than service costs	0.9	1.0	3.9
Increase in fair value of equity investments	15.1	0.0	0.0
Loss on debt redemption and refinancing activities	0.0	(16.1)	(1.9)
Other, net	5.8	8.3	1.0
Other income (expense), net	$ 17.2	$ (19.5)	$ (18.1)