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Summary of Significant Accounting Policies (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) joint_venture | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Significant Accounting Policies [Line Items] |  |  |
Foreign Currency Transaction Gain (Loss), before Tax | $ (3.5) | $ (0.2) | $ 0.8
Royalty Income [Abstract] |  |  |
Royalty income | 3.9 | 8.3 | 9.6
Business Combinations [Abstract] |  |  |
Acquisition Costs | $ 0.2 | 1.8 | 2.6
Capitalized Computer Software [Abstract] |  |  |
Software useful life | 7 years |  |
Amortization of capitalized software | $ 1.1 | 1.0 | $ 2.0
Accumulated amortization of capitalized software costs | $ 35.4 | $ 31.5 |
Restricted Stock [Member] | Minimum [Member] |  |  |
Restricted Stock Plan Performance Based Shares [Abstract] |  |  |
Share based compensation vesting period (years) | 2 years |  |
Restricted Stock [Member] | Maximum [Member] |  |  |
Restricted Stock Plan Performance Based Shares [Abstract] |  |  |
Share based compensation vesting period (years) | 4 years |  |
Restricted Stock Performance Plan [Member] | Minimum [Member] |  |  |
Restricted Stock Plan Performance Based Shares [Abstract] |  |  |
Plan performance period (years) | 1 year |  |
China [Member] |  |  |
Principles of Consolidation [Abstract] |  |  |
Number of joint ventures | joint_venture | 2 |  |
Ownership of joint ventures (as a percent) | 50.00% |  |
Accounting Standards Update 2016-16 |  |  |
Significant Accounting Policies [Line Items] |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets | $ 2.2 |  |

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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e1043-128460 + Details
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