Long-term Debt (Details) $ in Millions	12 Months Ended
Dec. 31, 2019 USD ($)
Debt Instrument [Line Items]
Long-term Debt, Maturities, 2020	$ 12.3
Long-term Debt, Maturities, 2021	1.1
Long-term Debt, Maturities, 2022	1.1
Long-term Debt, Maturities, thereafter through 2033	1.1
Loans Payable1 [Member]
Debt Instrument [Line Items]
Face Amount	$ 111.0
Debt Instrument, Term	5 years
Debt Instrument, Interest Rate During Period	1.20%

Face (par) amount of debt instrument at time of issuance.

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The average effective interest rate during the reporting period.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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