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Consolidated Statements of Equity - USD ($)
$ in Millions
Total
Common Stock
Paid-In Capital
Accumulated Other Comprehensive (Loss) Income
Accumulated Other Comprehensive (Loss) Income
Cumulative Effect of Adjustment [Member]
Retained Earnings
Retained Earnings
Cumulative Effect of Adjustment [Member]
Treasury Stock
Non- controlling Interests
Beginning Balance at Dec. 31, 2017 $ 2,601.1 $ 1.7 $ 2,724.9 $ (39.2)   $ 1,174.2   $ (1,262.1) $ 1.6
Comprehensive income:                  
Net income 389.8         389.6     0.2
Other comprehensive income (loss) (27.8)     (27.8)          
Stock options exercised 5.1 0.1 5.0            
Stock-based compensation 22.1   36.1         (14.0)  
Treasury stock purchase (694.6)             (694.6)  
Dividends (115.7)         (115.7)      
Ending Balance at Dec. 31, 2018 2,180.0 1.8 2,766.0 (67.0)   1,448.1   (1,970.7) 1.8
Comprehensive income:                  
Net income 431.3         431.9     (0.6)
Other comprehensive income (loss) 3.0     3.0          
Stock options exercised 17.3   17.3            
Stock-based compensation 21.8   30.5         (8.7)  
Adoption of ASU 2018-02 | ASU 2018-02 [Member]         $ (8.6)   $ 8.6    
Treasury stock purchase (100.0)             (100.0)  
Dividends (125.6)         (125.6)      
Ending Balance at Dec. 31, 2019 2,427.8 1.8 2,813.8 (72.6)   1,763.0   (2,079.4) 1.2
Comprehensive income:                  
Net income 554.4         553.1     1.3
Other comprehensive income (loss) 17.5     17.5          
Stock options exercised 64.9   64.9            
Stock-based compensation 36.9   47.6         (10.7)  
Treasury stock purchase (187.6)             (187.6)  
Dividends to non-controlling interest (2.5)               $ (2.5)
Dividends (135.9)         (135.9)      
Ending Balance at Dec. 31, 2020 $ 2,775.5 $ 1.8 $ 2,926.3 $ (55.1)   $ 2,180.2   $ (2,277.7)