Fair Value Measurements - Narrative (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Credit risk valuation adjustment (less than)	$ 0.1	$ 0.1

Amount of credit risk valuation adjustment to derivative assets to properly reflect the credit quality of the counterparties.

No definition available.

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