Commitments and Contingencies Commitments and Contingencies - Contingencies and Litigation (Details) $ in Millions	3 Months Ended
Jun. 30, 2018 USD ($)
Litigation Settlement, Amount Awarded from Other Party	$ 2.0

Amount awarded from other party in judgment or settlement of litigation.

No definition available.

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