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Condensed Consolidated Statement of Changes in Stockholder's Equity - USD ($)
$ in Millions
Common Stock
Treasury Stock
Additional Paid-In Capital
Retained Earnings
Cumulative Effect, Period of Adoption, Adjustment
Retained Earnings
Accumulated Other Comprehensive Income (loss), net
Cumulative Effect, Period of Adoption, Adjustment
Total
Beginning balance at Dec. 31, 2019 $ 1.2 $ (887.1) $ 2,691.3 $ (0.4) $ 1,512.6 $ 37.6 $ (0.4) $ 3,355.6
Increase (Decrease) in Stockholders' Equity                
Cash dividends on common stock         (40.0)     (40.0)
Stock-based compensation     8.3         8.3
Repurchases of common stock from employee stock plans   (13.9)           (13.9)
Purchase of common stock   (119.5)           (119.5)
Shares issued under employee stock purchase plan     0.1         0.1
Net income         157.4     157.4
Other comprehensive (loss) income           (37.5)   (37.5)
Ending balance at Mar. 31, 2020 1.2 (1,020.5) 2,699.7   1,629.6 0.1   3,310.1
Beginning balance at Dec. 31, 2019 1.2 (887.1) 2,691.3 $ (0.4) 1,512.6 37.6 $ (0.4) 3,355.6
Increase (Decrease) in Stockholders' Equity                
Net income               271.0
Ending balance at Jun. 30, 2020 1.2 (1,120.5) 2,704.5   1,703.7 (2.6)   3,286.3
Beginning balance at Mar. 31, 2020 1.2 (1,020.5) 2,699.7   1,629.6 0.1   3,310.1
Increase (Decrease) in Stockholders' Equity                
Cash dividends on common stock         (39.5)     (39.5)
Stock-based compensation     4.6         4.6
Exercise of common stock options     0.2         0.2
Repurchases of common stock from employee stock plans   (0.2)           (0.2)
Purchase of common stock   (99.8)           (99.8)
Net income         113.6     113.6
Other comprehensive (loss) income           (2.7)   (2.7)
Ending balance at Jun. 30, 2020 1.2 (1,120.5) 2,704.5   1,703.7 (2.6)   3,286.3
Beginning balance at Dec. 31, 2020 1.2 (1,250.4) 2,713.3   1,809.8 75.0   3,348.9
Increase (Decrease) in Stockholders' Equity                
Cash dividends on common stock         (45.3)     (45.3)
Stock-based compensation 0.1   11.7         11.8
Repurchases of common stock from employee stock plans   (5.7)           (5.7)
Purchase of common stock   (47.6)           (47.6)
Shares issued under employee stock purchase plan     0.1         0.1
Net income         137.2     137.2
Other comprehensive (loss) income           4.8   4.8
Ending balance at Mar. 31, 2021 1.3 (1,303.7) 2,725.1   1,901.7 79.8   3,404.2
Beginning balance at Dec. 31, 2020 1.2 (1,250.4) 2,713.3   1,809.8 75.0   3,348.9
Increase (Decrease) in Stockholders' Equity                
Net income               242.7
Other comprehensive (loss) income           10.8    
Ending balance at Jun. 30, 2021 1.3 (1,337.5) 2,730.7   1,962.2 85.8   3,442.5
Beginning balance at Mar. 31, 2021 1.3 (1,303.7) 2,725.1   1,901.7 79.8   3,404.2
Increase (Decrease) in Stockholders' Equity                
Cash dividends on common stock         (45.0)     (45.0)
Stock-based compensation     5.5         5.5
Repurchases of common stock from employee stock plans   (0.1)           (0.1)
Purchase of common stock   (33.7)           (33.7)
Shares issued under employee stock purchase plan     0.1         0.1
Net income         105.5     105.5
Other comprehensive (loss) income           6.0   6.0
Ending balance at Jun. 30, 2021 $ 1.3 $ (1,337.5) $ 2,730.7   $ 1,962.2 $ 85.8   $ 3,442.5