Amount, before allowance for credit loss, of financing receivable.

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 55
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
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-Section 50
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-Publisher FASB
-Name Accounting Standards Codification
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-Section 55
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Name:	us-gaap_NotesReceivableGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Subsequent Events - Additional Information (Details) - APC - USD ($) $ in Millions	1 Months Ended		9 Months Ended
	Oct. 31, 2020	Sep. 30, 2020	Sep. 30, 2020	Sep. 30, 2019
Subsequent Event [Line Items]
Dividends declared		$ 5.0	$ 49.5	$ 59.7
Subsequent Event \| Notes Receivable \| AHMC
Subsequent Event [Line Items]
Note receivable, amount	$ 4.0
Note receivable, maturity period	2 years
Note receivable, interest rate	3.75%