Commitments and Contingencies Collateralized letters of credit (Details) $ in Millions	Mar. 31, 2020 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Letters of Credit Outstanding, Amount	$ 9.7

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

No definition available.

Name:	us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant