Preferred Stock (Tables)

12 Months Ended

Dec. 31, 2019

Class of Stock Disclosures [Abstract]

Schedule of preferred stock by class

The following table shows preferred stock authorized and outstanding at December 31, 2019 and 2018:

(in millions, except share and per share amounts)	Shares Authorized	Shares Outstanding	Redemption Price Per Share		Total
$100 par value, Six Per Cent. Preferred Stock	45,000	44,498	—		$	4.4
$100 par value, Serial Preferred Stock 3.60% Series	2,286,500	260,000	$	101	26.0
$25 par value, Serial Preferred Stock	5,000,000	—	—		—
Total					$	30.4