Income Taxes - Temporary Differences (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Gross Deferred Tax Assets:
Bad debt reserve	$ 4.2	$ 4.7
Net operating loss	40.1	33.7
Accrued and other share-based compensation	27.1	23.2
Accrued expenses	6.0	10.2
U.S. foreign income tax credits	3.0	2.3
Other income tax credits	0.2	0.2
Customer deposits	3.1	3.1
Investments	1.9	1.9
Cash flow hedges	3.9	0.0
Other	0.7	0.0
Total gross deferred tax assets	90.1	79.4
Less: Valuation allowance	32.5	24.3
Gross deferred tax assets, net of valuation allowance	57.6	55.1
Deferred Tax Liabilities:
Depreciation	(11.7)	(11.2)
Goodwill and intangible assets	(53.5)	(47.5)
Unrealized foreign exchange	(6.3)	(4.5)
Prepaid expenses, deductible for tax purposes	(4.2)	(3.9)
Deferred tax costs on foreign unrepatriated earnings	(12.0)	(11.3)
Unrealized derivatives	(3.8)	(4.1)
Cash flow hedges	0.0	(2.5)
Other	0.0	(3.5)
Total gross deferred tax liabilities	(91.6)	(88.5)
Net deferred tax liability	34.0	33.4
Net deferred tax asset	0.0	0.0
Reported on the consolidated balance sheets as:
Identifiable intangible and other non-current assets for deferred tax assets, non-current	20.7	11.4
Non-current income tax liabilities, net of deferred tax liabilities, non-current	$ 54.1	$ 44.8