Stockholder's Equity - Cash Dividends Paid or Payable per Share (Details) - $ / shares	3 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018
Earnings Per Share [Abstract]
Dividend, common stock, declared (in dollars per share)	$ 0.27	$ 0.27	$ 0.24	$ 0.24	$ 0.24	$ 0.24	$ 0.22	$ 0.22