Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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Name:	us-gaap_TreasuryStockValueAcquiredCostMethod
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Shareholders' Equity - Stock Repurchase Program (Details) - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Nov. 06, 2018
Class of Stock [Line Items]
Repurchase of common stock (shares)	1,236,854	58,713	4,175,576
Repurchase of common stock	$ 43,000,000.0	$ 1,900,000	$ 147,800,000
Common Stock
Class of Stock [Line Items]
Stock Repurchase Program, Authorized Amount				$ 500,000,000.0
Stock Purchase Agreement [Member]
Class of Stock [Line Items]
Stock Repurchase Program, Remaining Authorized Repurchase Amount		$ 229,700,000