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Other Assets (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]
Patent amortization	$ 0.3	$ 0.3	$ 0.3
Patents [Member]
Schedule of Equity Method Investments [Line Items]
Estimated accumulated amortization, 2021	0.4
Estimated accumulated amortization, 2022	0.4
Estimated accumulated amortization, 2023	0.4
Estimated accumulated amortization, 2024	0.4
Estimated accumulated amortization, 2025	0.4
Trade name [Member]
Schedule of Equity Method Investments [Line Items]
Estimated accumulated amortization, 2021	0.4
Estimated accumulated amortization, 2022	0.4
Estimated accumulated amortization, 2023	0.4
Estimated accumulated amortization, 2024	0.4
Estimated accumulated amortization, 2025	0.4
Customer Relationships [Member]
Schedule of Equity Method Investments [Line Items]
Estimated accumulated amortization, 2021	0.1
Estimated accumulated amortization, 2022	0.1
Estimated accumulated amortization, 2023	0.1
Estimated accumulated amortization, 2024	0.1
Estimated accumulated amortization, 2025	$ 0.1

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