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Cash and Marketable Securities - Marketable Securities (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Cash and Cash Equivalents [Abstract]
Restricted debt securities, cost	$ 12.6	$ 6.4
Restricted debt securities, gross unrealized gains	0.0	0.0
Restricted debt securities, gross unrealized losses	0.0	0.0
Restricted debt securities, fair value	$ 12.6	$ 6.4

X

- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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- Definition

Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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- Definition

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

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