Stockholders' Equity (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Equity, Class of Treasury Stock [Line Items]
Treasury stock purchase plan	$ 100.0
Treasury stock purchase plan remaining available	$ 100.0
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation	80,186	26,307	27,636
Payment, Tax Withholding, Share-based Payment Arrangement	$ 18.6	$ 6.3	$ 4.1
Treasury Stock, Common, Shares	850	408	0