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Shareholders' Equity (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Nov. 13, 2014
Dividends per share (in dollars per share)	$ 0.80	$ 0.76	$ 0.76
Treasury stock, shares acquired (in shares)	1,057,115
Treasury Stock, Value, Acquired, Cost Method	$ 32,100,000	$ 15,000,000.0
Remaining authorized repurchase amount	$ 113,600,000
Share repurchase program 2015
Authorized repurchase amount				$ 500,000,000.0
Treasury stock, shares acquired (in shares)		324,889	0

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- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

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Amount of stock repurchase plan authorized.

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

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