Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4CC
-URI http://asc.fasb.org/extlink&oid=125515794&loc=SL109998890-113959

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5624171-113959

Name:	us-gaap_DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Derivatives - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
Derivatives - Narrative (Details) - USD ($) $ in Millions	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Mar. 31, 2021	Sep. 30, 2020
Derivative [Line Items]
Gain (loss) on derivative not designed as hedging instrument	$ (0.6)	$ 1.3	$ (1.6)	$ (1.4)
Designated as Hedging Instrument \| Interest rate swaps
Derivative [Line Items]
Derivative, terminated notional value					$ 300.0	$ 150.0
Designated as Hedging Instrument \| Interest rate swaps \| Loss On Extinguishment Of Debt
Derivative [Line Items]
Derivative, terminated notional value	$ 25.1		$ 25.1