Stockholders' Equity - Dividends (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended			6 Months Ended
	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Apr. 23, 2020
Subsidiary or Equity Method Investee [Line Items]
Dividend amount for current period (in dollars per share)	$ 0.95	$ 0.90	$ 0.90
Aggregated dividend paid				$ 52.2
Dividend payable date declared				Feb. 25, 2020
Common stock Dividend Payable Date				Apr. 15, 2020
Dividend payable date of record				Mar. 31, 2020
Sixth Amended And Restated Credit Agreement [Member]
Subsidiary or Equity Method Investee [Line Items]
Dividends permitted amount per quarter					$ 0.01