Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2016
Deferred tax assets:
Accrued expenses	$ 7.5	$ 5.3
Compensation	32.6	26.9
Investments	0.1
Deferred revenue	8.4
Net operating loss carryforwards	21.2	24.3
Fixed assets	2.9	3.9
Foreign tax and other tax credit carryforwards	11.0	8.3
Unrealized currency gain/loss	6.1	1.1
Lease obligations	16.3
Gross deferred tax assets	106.1	69.8
Less valuation allowance	(4.2)	(4.3)	$ (0.5)
Total deferred tax assets	101.9	65.5
Deferred tax liabilities:
Accounts receivable	0.6	1.2
Investments		0.5
Inventory	13.3	1.8
Deferred revenue		5.9
Fixed assets	4.9
Foreign statutory reserves	2.2	0.4
Intangibles	40.1	47.6
Accrued expenses	0.9	0.3
Accrued Withholding tax	5.2	4.8
Right of use asset	15.6
Other	7.4	3.2
Total deferred tax liabilities	90.2	65.7
Net deferred tax assets	$ 11.7
Net deferred tax liabilities		$ (0.2)