Goodwill and Other Intangible Assets - Intangible Assets (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Amortization of Intangible Assets	$ 8.0	$ 10.0	$ 10.0
Gross carrying amount	156.2	156.2
Accumulated amortization	(68.3)	(59.9)
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2021	8.0
2022	8.0
2023	8.0
2024	8.0
2025	8.0
Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	76.8	76.8
Accumulated amortization	(33.4)	(29.7)
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	27.0	27.0
Accumulated amortization	(10.4)	(9.3)
Trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	52.4	52.4
Accumulated amortization	$ (24.5)	$ (20.9)

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

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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