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Equity (Stock Repurchase Program) (Details) - USD ($) $ / shares in Units, shares in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Aug. 04, 2021	Jul. 31, 2021
Stock repurchase program
Shares repurchased and retired during period (in shares)	1.8	2.5
Common stock value repurchased including acquisition costs	$ 32,400,000	$ 27,800,000
Average cost per share of repurchased shares (in dollars per share)	$ 17.57	$ 10.98
Stock repurchase program, authorized amount			$ 50,000,000.0
Maximum
Stock repurchase program
Stock repurchase program, authorized amount	$ 50,000,000.0
Stock repurchase program remaining authorized amount				$ 33,000,000.0

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Common Stock Value Acquired Including Acquisition Costs

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Amount of stock repurchase plan authorized.

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Number of shares that have been repurchased and retired during the period.

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