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Shareholders' Equity (Schedule of Stock by Class) (Details) - $ / shares
shares in Millions
Dec. 31, 2021
Dec. 31, 2020
Class of Stock [Line Items]    
Treasury Stock (shares) 1.4 0.8
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) 40.8 40.2
Treasury Stock (shares) 0.9 0.2
Total Issued Shares 41.7 40.4
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