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Capital Stock (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Sep. 12, 2020
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Jun. 11, 2019
Class of Stock [Line Items]                
Stock Repurchase Program, Number of Shares Authorized to be Repurchased 5,500,000              
Incremental Common Shares Attributable to Dilutive Effect of Accelerated Share Repurchase Agreements 3,000,000.0              
Stock repurchased and retired (in shares)   284   482 127,464 1,093,741    
Accelerated Share Repurchases, Adjustment to Recorded Amount         $ 2.9      
Shares repurchased, average cost per share (in dollars per share)         $ 39.69      
Shares repurchased during the period as percentage of shares authorized for repurchase (percent)         1.30%      
Common shares issued (in shares)   18,477   19,200 19,081 19,491    
Class A Common Stock                
Class of Stock [Line Items]                
Shares outstanding (in shares)   41,720,638     41,720,638   40,335,113  
Stock Repurchase Program, Number of Shares Authorized to be Repurchased               2,500,000
Stock repurchased and retired (in shares)     0   72,700      
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased   1,900,000     1,900,000      
Class B Common Stock                
Class of Stock [Line Items]                
Shares outstanding (in shares)   20,519,593     20,519,593   21,760,686  
Director [Member]                
Class of Stock [Line Items]                
Common shares issued (in shares)         19,081      
Director [Member] | Class A Common Stock                
Class of Stock [Line Items]                
Dividend, Share-based Payment Arrangement, Paid-in-Kind         $ 0.9