Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Deferred tax assets:
Accounts receivable	$ 2.0	$ 1.0
Accrued expenses	4.7	0.8
Compensation	30.1	21.0
Investments	1.4	0.6
Deferred revenue	0.2	3.9
Net operating loss carryforwards	16.0	30.3
Fixed assets	0.8
Inventory	2.9
Foreign tax and other tax credit carryforwards	32.3	21.8
Unrealized currency gain/loss	6.1	0.2
Warranty reserve		1.1
Other	7.5	5.7
Gross deferred tax assets	104.0	86.4
Less valuation allowance	(37.2)	(57.4)
Total deferred tax assets	66.8	29.0
Deferred tax liabilities:
Accounts receivable	0.6	2.9
Fixed assets		1.9
Foreign statutory reserves	5.3	4.5
Investments		0.1
Inventory		0.3
Intangibles	9.4	13.1
Accrued expenses	8.0
Total deferred tax liabilities	23.3	22.8
Net deferred tax assets	43.5	$ 6.2
Decrease in valuation allowance, primarily attributable to U.S. net operating loss and foreign tax credit usage as a result of the repatriation of foreign earnings to United States	20.1
Decrease in valuation allowance due to change in judgment regarding realizability of deferred tax assets	20.8
Repatriation of foreign earnings to the United States	$ 235.3