Goodwill and Other Intangible Assets - Intangible Assets and Amortization Expense (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets
Gross carrying amount	$ 92.1	$ 92.1
Accumulated amortization	52.4	49.1
Unamortized intangible assets, gross carrying amount	35.7	35.7
Intangible assets, net	75.4	78.7
Amortization expense	3.3
Q4 2018	9.7
2019	7.7
2020	7.1
2021	7.0
2022	6.6
Trademarks
Finite-Lived Intangible Assets
Unamortized intangible assets, gross carrying amount	32.0	32.0
In Process Research and Development [Member]
Finite-Lived Intangible Assets
Unamortized intangible assets, gross carrying amount	3.7	3.7
Trademarks
Finite-Lived Intangible Assets
Gross carrying amount	1.0	1.0
Accumulated amortization	0.4	0.4
Patents
Finite-Lived Intangible Assets
Gross carrying amount	40.8	40.8
Accumulated amortization	37.3	36.1
Customer relationships
Finite-Lived Intangible Assets
Gross carrying amount	12.0	12.0
Accumulated amortization	5.7	5.2
0
Finite-Lived Intangible Assets
Gross carrying amount	36.5	36.5
Accumulated amortization	8.2	6.7
Non-competition agreements
Finite-Lived Intangible Assets
Gross carrying amount	1.8	1.8
Accumulated amortization	$ 0.8	$ 0.7

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit.

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Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

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