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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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