Derivatives - Interest Rate Risk - Narratives (Details) - Derivatives Designated as Hedging Instruments - Interest Rate Swaps $ in Millions	Jun. 30, 2020 USD ($)
Derivatives
Deferred pre-tax losses to be reclassified during next 12 months	$ 4.7
Weighted average effective fixed interest rate on interest rate swaps (as a percent)	1.80%

The estimated net amount of unrealized gains or losses on interest rate cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve months.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=121549185&loc=d3e80748-113994

Name:	us-gaap_InterestRateCashFlowHedgeGainLossToBeReclassifiedDuringNext12MonthsNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant