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Shareholders' Equity (Narrative and Dividends) (Details)	3 Months Ended				9 Months Ended
	Sep. 30, 2020 USD ($) stock_class vote $ / shares shares	Jun. 30, 2020 $ / shares	Sep. 30, 2019 USD ($) $ / shares shares	Jun. 30, 2019 $ / shares	Sep. 30, 2020 USD ($) stock_class vote $ / shares shares	Sep. 30, 2019 USD ($) shares	Dec. 31, 2019 $ / shares shares	Jul. 30, 2018 USD ($)
Shareholders' Equity [Line Items]
Number of classes of common stock | stock_class	3				3
Preferred stock, authorized shares	500,000				500,000		500,000
Preferred stock, par value (in dollars per share) | $ / shares	$ 0.01				$ 0.01		$ 0.01
Preferred stock, issued shares	0				0		0
Employee stock ownership plan contribution expense | $	$ 0		$ 0		$ 0	$ 0
Cash dividend declared (USD per share) | $ / shares	$ 0.15	$ 0.15	$ 0.30	$ 0.30
Common Class A
Shareholders' Equity [Line Items]
Number of votes | vote	1				1
Common stock, authorized shares	105,000,000.0				105,000,000.0		105,000,000.0
Share repurchase program, authorized amount | $								$ 100,000,000.0
Shares repurchased (in shares)	0		0		0	0
Remaining authorized repurchases | $	$ 100,000,000.0				$ 100,000,000.0
Common Class B
Shareholders' Equity [Line Items]
Number of votes | vote	10				10
Common stock, authorized shares	80,000,000.0				80,000,000.0		80,000,000.0
Common Class C
Shareholders' Equity [Line Items]
Number of votes | vote	10				10
Common stock, authorized shares	20,000,000.0				20,000,000.0		20,000,000.0

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