Commitments and Contingencies - Investment Commitments (Details) - Nov. 02, 2019 € in Millions, $ in Millions	EUR (€)	USD ($)
Private equity fund
Investment commitments
Unfunded commitment to invest in private equity fund	€ 3.6	$ 4.1

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.

No definition available.

Name:	us-gaap_OtherCommitmentsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration