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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               380.9
Ending balance at Sep. 30, 2020 1.2 (1,162.4) 2,708.9   1,767.8 29.0   3,344.5
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
Increase (Decrease) in Stockholders' Equity                
Cash dividends on common stock         (45.8)     (45.8)
Stock-based compensation     4.4         4.4
Repurchases of common stock from employee stock plans   (0.1)           (0.1)
Purchase of common stock   (41.8)           (41.8)
Net income         109.9     109.9
Other comprehensive (loss) income           31.6   31.6
Ending balance at Sep. 30, 2020 1.2 (1,162.4) 2,708.9   1,767.8 29.0   3,344.5
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               363.1
Other comprehensive (loss) income           (9.0)    
Ending balance at Sep. 30, 2021 1.3 (1,337.7) 2,736.3   2,031.1 66.0   3,497.0
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
Increase (Decrease) in Stockholders' Equity                
Cash dividends on common stock         (51.5)     (51.5)
Stock-based compensation     5.5         5.5
Repurchases of common stock from employee stock plans   (0.2)           (0.2)
Shares issued under employee stock purchase plan     0.1         0.1
Net income         120.4     120.4
Other comprehensive (loss) income           (19.8)   (19.8)
Ending balance at Sep. 30, 2021 $ 1.3 $ (1,337.7) $ 2,736.3   $ 2,031.1 $ 66.0   $ 3,497.0