Stockholders' Equity Share Repurchase Programs (Details) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($) $ / shares shares
Equity [Abstract]
Accelerated Share Repurchases, Settlement (Payment) or Receipt | $	$ 400.0
Accelerated Share Repurchase, Settlement off Shares Repurchased | shares	16
Accelerated Share Repurchases, Final Price Paid Per Share | $ / shares	$ 24.43
Share Repurchase Program, Open Market | shares	9,000,000
Share repurchase program, open market, average price per share | $ / shares	$ 26.60