The cash inflow associated with the aggregate amount received by the entity through sale or maturity of marketable securities (held-to-maturity or available-for-sale) during the period.

No definition available.

Name:	us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Investments in Marketable Securities - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract]
Proceeds received from sales of marketable securities	$ 16.7	$ 2.9	$ 80.8	$ 21.4
Variable Interest Entity, Primary Beneficiary
Investments in and Advances to Affiliates [Line Items]
Fair value of deconsolidated investment in affiliate	$ 43.4		$ 43.4		$ 38.1