Common Stock (Details) - $ / shares shares in Millions	May 01, 2020	Dec. 31, 2020	Dec. 31, 2019
Equity [Abstract]
Stock Issued During Period, Shares, New Issues	80.5
Common stock, par value (in dollars per share)	$ 1.00	$ 1.00	$ 1.00
Shares Issued, Price Per Share	$ 28.50
Class of Warrant or Right, Outstanding		2.7
Common stock reserved for issuance pursuant to Employee stock benefit plans (in shares)		60.0
Common stock reserved for issuance and not granted pursuant to Employee stock benefit plans (in shares)		25.0
Stock Issued During Period Shares New Issues - Underwriters Option	10.5