Stockholders' Equity (Tables)

6 Months Ended

Jun. 30, 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:

	Six Months Ended June 30,
	2019			2018
	Shares	Amount		Shares	Amount
2019 Stock Purchase Plan	31,268	$	1.9	—	$	—
2018 Stock Purchase Plan	—	—		79,179	6.3