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Fair Value Measurements - Fair Value of Assets and Liabilities Measured on Recurring Basis (Details) - Fair Value, Measurements, Recurring - Demand and time deposits - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Quoted Prices in Active Markets (Level 1)
Assets:
Cash and cash equivalents	$ 8.5	$ 28.2
Level 2
Assets:
Cash and cash equivalents	0.0	0.0
Fair Value Inputs (Level 3)
Assets:
Cash and cash equivalents	0.0	0.0
Estimate of Fair Value Measurement
Assets:
Cash and cash equivalents	$ 8.5	$ 28.2

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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