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Stock Repurchase Plans and Shareholder Rights Plan (Details)
6 Months Ended
Jul. 24, 2020
USD ($)
$ / shares
shares
Jun. 30, 2020
USD ($)
$ / shares
Jun. 30, 2019
USD ($)
$ / shares
Mar. 31, 2020
USD ($)
item
$ / shares
Dec. 31, 2019
$ / shares
Mar. 30, 2017
USD ($)
Equity, Class of Treasury Stock            
Value of shares repurchased   $ 6,000 $ 4,000      
Par value | $ / shares   $ 1.00 $ 1.00   $ 1.00  
Preferred share purchase right            
Equity, Class of Treasury Stock            
Dividend, Preferred share purchase right       1    
Share price | $ / shares       $ 75.00    
Exercisable exercise price of the Right | item       2    
Series B Junior Preferred Stock | Preferred share purchase right            
Equity, Class of Treasury Stock            
Percentage of purchase of a preferred shares represented by rights       0.001    
Par value | $ / shares       $ 1.00    
March 2017 Stock Repurchase Plan            
Equity, Class of Treasury Stock            
Amount authorized of shares to be repurchased under Stock Repurchase Program           $ 500,000,000.0
Total number of shares purchased (in shares) | shares 4,605,000          
Value of shares repurchased $ 268,300,000          
Shares acquired, average cost (in dollars per share) | $ / shares $ 58.26          
Permitted dollar value of repurchases remaining $ 231,700,000