Shareholders' Equity (Schedule of Stock by Class) (Details) - $ / shares shares in Millions	Dec. 31, 2022	Dec. 31, 2021
Class of Stock [Line Items]
Treasury Stock (shares)	3.9	1.4
Common Class A
Class of Stock [Line Items]
Common stock, par value (in dollars per share)	$ 0.025	$ 0.025
Authorized Shares	105.0	105.0
Common Stock Outstanding (shares)	39.2	40.8
Treasury Stock (shares)	3.4	0.9
Total Issued Shares	42.6	41.7
Common Class B
Class of Stock [Line Items]
Common stock, par value (in dollars per share)	$ 0.025	$ 0.025
Authorized Shares	80.0	80.0
Common Stock Outstanding (shares)	13.5	13.5
Treasury Stock (shares)	0.0	0.0
Total Issued Shares	13.5	13.5
Common Class C
Class of Stock [Line Items]
Common stock, par value (in dollars per share)	$ 0.025	$ 0.025
Authorized Shares	20.0	20.0
Common Stock Outstanding (shares)	0.0	0.0
Treasury Stock (shares)	0.5	0.5
Total Issued Shares	0.5	0.5