Employee Benefit Plans (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
United States Employees, Defined Contribution [Member]
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Defined contribution benefit plans	$ 4.7	$ 4.1	$ 3.5
International Employees, Defined Contribution [Member]
Deferred Compensation Arrangement with Individual, Postretirement Benefits [Line Items]
Defined contribution benefit plans	$ 0.2	$ 0.2	$ 0.1

The amount of the cost recognized during the period for defined contribution plans.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 70

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942

Name:	us-gaap_DefinedContributionPlanCostRecognized
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration