Fair Value of Financial Instruments - Time and Call Deposits (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Investments in time and call deposits
Restricted Cash	$ 3.6	$ 3.9
Cash Equivalents	9.0
Short-term Investments	$ 6.6	$ 0.0
Minimum
Investments in time and call deposits
Maturity of time deposits	1 month
Maximum
Investments in time and call deposits
Maturity of time deposits	12 months
Period of ability to redeem invested amounts on call deposits	95 days

The period over which the entity has the ability to receive back invested amounts for call deposits.

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Original maturity period to maturity for time deposits.

+ References

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Amount of 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. Excludes cash and cash equivalents within disposal group and discontinued operation.

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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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Amount of cash and cash equivalents restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, 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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Amount of investments including trading securities, available-for-sale securities, held-to-maturity securities, and short-term investments classified as other and current.

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