Shareholders' Equity - Equity Stocks Information (Details) shares in Millions	Dec. 31, 2020 $ / shares shares
Class of Stock [Line Items]
Preferred stock, shares authorized (shares)	22.0
Preferred stock, par value (dollars per share) | $ / shares	$ 1.00
Common stock, authorized (shares)	437.5
Share-based Payment Arrangement
Class of Stock [Line Items]
Common stock, capital shares reserved for future issuance (shares)	26.0
Series A
Class of Stock [Line Items]
Common stock, capital shares reserved for future issuance (shares)	7.0