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Significant Accounting Policies (Details) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019 USD ($) plan	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2019 USD ($) plan	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Jan. 01, 2019 USD ($)	Jan. 01, 2018 USD ($)	Nov. 06, 2017
Disaggregation of Revenue
Sales	$ 342.4	$ 357.8	$ 309.6	$ 289.3	$ 290.1	$ 272.2	$ 277.9	$ 244.1	$ 1,299.1	$ 1,084.3	$ 842.9
Cost of sales									962.3	788.4	611.3
Advertising costs									4.3	4.0	4.2
Research and development expense									$ 11.0	11.1	7.1
Number of pension plans (plans) | plan	2								2
Right of use assets	$ 34.0								$ 34.0
Operating lease liability	34.1								34.1
Retained earnings	$ 500.3				$ 453.9				500.3	453.9
ASU 2016-02
Disaggregation of Revenue
Right of use assets												$ 34.8
Operating lease liability												$ 34.8
ASU 2014-09 | Effect of adoption Higher (Lower)
Disaggregation of Revenue
Retained earnings													$ 1.6
Shipping
Disaggregation of Revenue
Sales									12.1	11.4	8.5
Cost of sales									$ 18.3	$ 16.9	$ 11.1
Minimum
Disaggregation of Revenue
Finite lived intangible asset useful life									2 years
Maximum
Disaggregation of Revenue
Finite lived intangible asset useful life									15 years
Convertible Debt | Convertible Notes, due 2024
Disaggregation of Revenue
Debt instrument stated interest rate (percent)	1.00%								1.00%					1.00%

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The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.

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