Stockholders' Equity (Tables)

3 Months Ended

Mar. 31, 2019

Stockholders' Equity Note [Abstract]

Schedule of shares purchased under the respective stock purchase plans

The following table shows shares purchased and value ($ in millions) under the respective stock purchase plans:

	Three Months Ended March 31,
	2019			2018
	Shares	Amount		Shares	Amount
2019 Stock Purchase Plan	4,285	$	0.3	—	$	—
2018 Stock Purchase Plan	—	—		66,724	5.3