Subsequent Events (Details) - USD ($) $ in Millions		2 Months Ended	12 Months Ended
	Jan. 31, 2019	Feb. 25, 2019	Dec. 31, 2018
Subsequent Event [Line Items]
Granted (in shares)			112,075
Granted (in shares)			1,480,490
Subsequent Event | Open Market
Subsequent Event [Line Items]
Stock repurchased during period (in shares)		5,799
Stock repurchased during period		$ 0.2
Subsequent Event | 401(k) Savings and Investment Plan
Subsequent Event [Line Items]
Stock repurchased during period (in shares)		58,386
Stock repurchased during period		$ 2.2
Subsequent Event | Restricted Stock
Subsequent Event [Line Items]
Granted (in shares)	77,434
Subsequent Event | Stock Option | Non-Officer Employees
Subsequent Event [Line Items]
Granted (in shares)	840,000