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Summary of Significant Accounting Policies - Narrative (Details) $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 USD ($) joint_venture | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) joint_venture | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Jan. 01, 2019 USD ($) | Jan. 01, 2018 USD ($)
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ 248.7 | $ 260.3 | $ 270.4 | $ 261.9 | $ 235.7 | $ 257.8 | $ 255.3 | $ 233.3 | $ 1,041.3 | $ 982.1 | $ 839.9 |  |
Foreign currency transaction losses |  |  |  |  |  |  |  |  | 1.5 | 3.5 | 0.2 |  |
Restricted cash | 0.6 |  |  |  |  |  |  |  | 0.6 |  |  |  |
Acquisition costs |  |  |  |  |  |  |  |  | $ 0.0 | 0.2 | 1.8 |  |
Software useful life |  |  |  |  |  |  |  |  | 7 years |  |  |  |
Amortization of capitalized software |  |  |  |  |  |  |  |  | $ 1.6 | 1.1 | 1.0 |  |
Accumulated amortization of capitalized software costs | 35.5 |  |  |  | $ 35.4 |  |  |  | 35.5 | 35.4 |  |  |
Accounting Standards Update 2016-16 |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative-effect adjustment directly to retained earnings |  |  |  |  |  |  |  |  |  |  |  |  | $ 2.2
Accounting Standards Update 2018-02 |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative-effect adjustment directly to retained earnings | $ 4.9 |  |  |  |  |  |  |  | $ 4.9 |  |  |  |
Accounting Standards Update 2014-09 |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative-effect adjustment directly to retained earnings |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.5
Accounting Standards Update 2016-02 | Scenario, Forecast | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Right-of-use assets |  |  |  |  |  |  |  |  |  |  |  | $ 25.0 |
Lease obligation liabilities |  |  |  |  |  |  |  |  |  |  |  | $ 27.0 |
Accounting Standards Update 2017-07 |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Pension expense reclassified |  |  |  |  |  |  |  |  |  | $ 3.6 | 3.9 |  |
Restricted Stock | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation vesting period (years) |  |  |  |  |  |  |  |  | 2 years |  |  |  |
Restricted Stock | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation vesting period (years) |  |  |  |  |  |  |  |  |  | 4 years |  |  |
Restricted Stock Performance Plan | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Plan performance period (years) |  |  |  |  |  |  |  |  | 1 year |  |  |  |
Royalty |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | $ 5.9 | $ 3.9 | $ 8.3 |  |
China |  |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of joint ventures | joint_venture | 2 |  |  |  |  |  |  |  | 2 |  |  |  |
Ownership of joint ventures (as a percent) | 50.00% |  |  |  |  |  |  |  | 50.00% |  |  |  |

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