Income Taxes (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Domestic and foreign components of income before taxes:
Domestic	$ (83.2)	$ (42.4)	$ (11.6)
Foreign	184.5	167.0	149.9
Income before income taxes and noncontrolling interest in consolidated subsidiaries	101.3	124.6	138.3
Current income tax (benefit) expense:
Federal	(1.1)	0.2	1.4
State	0.4	0.2	0.9
Foreign	50.8	35.0	69.5
Total current income tax expense	50.1	35.4	71.8
Deferred income tax (benefit):
Federal	0.7	(1.8)	1.2
State	(0.1)	(0.6)
Foreign	(9.0)	9.8	(12.9)
Total deferred income tax (benefit)	(8.4)	7.4	(11.7)
Income tax provision	41.7	42.8	60.1
Reconciliation of United States federal statutory rate to effective income tax rate
Statutory tax rate (as a percent)	35.00%	35.00%	35.00%
Foreign tax rate differential (as a percent)	(12.10%)	(10.20%)	(7.20%)
Permanent differences (as a percent)	9.60%	12.00%	18.70%
Tax contingencies (as a percent)	(0.90%)	(1.10%)	3.00%
Change in tax rates (as a percent)	(1.60%)	0.10%	(0.70%)
Withholding taxes (as a percent)	0.60%	0.10%	0.30%
State income taxes, net of federal benefits (as a percent)	0.20%	0.10%	0.30%
Purchase accounting (as a percent)	0.70%	0.80%	0.90%
Tax credits (as a percent)	(4.30%)	(8.60%)	(9.50%)
Other (as a percent)	(1.20%)	0.60%	0.10%
Change in valuation allowance for unbenefited losses (as a percent)	15.20%	5.50%	2.60%
Effective tax rate (as a percent)	41.20%	34.30%	43.50%
Deferred tax assets:
Accounts receivable	1.0	2.7
Accrued expenses	0.8	3.1
Compensation	21.0	10.7
Investments	0.6	0.5
Deferred revenue	3.9	4.1
Net operating loss carryforwards	30.3	11.4
Capital loss carryforwards		0.8
Foreign tax and other tax credit carryforwards	21.8	18.8
Unrealized currency gain/loss	0.2	4.5
Warranty reserve	1.1	2.0
Other	5.7	3.6
Gross deferred tax assets	86.4	62.2
Less valuation allowance	(57.4)	(42.4)
Total deferred tax assets	29.0	19.8
Deferred tax liabilities:
Accounts receivable	2.9	0.4
Fixed assets	1.9	2.1
Foreign statutory reserves	4.5
Investments	0.1	0.2
Inventory	0.3	0.9
Intangibles	13.1	7.4
Accrued expenses		15.5
Unrealized currency gain/loss		4.2
Total deferred tax liabilities	22.8	30.7
Net deferred tax asset (liability)	6.2	(10.9)
Increase in valuation allowance, primarily due to unbenefited losses and credits in the U.S.	15.0
Decrease in valuation allowance due to change in judgment regarding realizability of deferred tax assets in certain foreign jurisdictions	5.6
Decrease in valuation allowance due to deferred tax liabilities recorded in conjunction with an acquisition	$ 1.3