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CONSOLIDATED CONDENSED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Millions, $ in Millions | Total | Common Stock | Treasury Stock | Additional Paid-in Capital | Retained Earnings | Total Accumulated Other Comprehensive Loss
--- | --- | --- | --- | --- | --- | ---
Beginning balance (in shares) at Dec. 31, 2018 |  | 215.2 | 7.5 |  |  |
Beginning balance at Dec. 31, 2018 | $ 3,140.4 | $ 215.2 | $ (1,015.4) | $ 1,384.4 | $ 2,694.7 | $ (138.5)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income (loss) | 249.7 |  |  |  | 249.7 |
Other comprehensive income (loss), net of tax | (2.7) |  |  |  |  | (2.7)
Common stock issued under equity plans (in shares) |  | 0.8 |  |  |  |
Common stock issued under equity plans | 45.0 | $ 0.8 |  | 44.2 |  |
Stock-based compensation expense | 20.8 |  |  | 20.8 |  |
Purchases of treasury stock (in shares) |  |  | 0.1 |  |  |
Purchases of treasury stock | (5.7) |  | $ (5.7) |  |  |
Ending balance (in shares) at Mar. 31, 2019 |  | 216.0 | 7.6 |  |  |
Ending balance at Mar. 31, 2019 | 3,447.5 | $ 216.0 | $ (1,021.1) | 1,449.4 | 2,944.4 | (141.2)
Beginning balance (in shares) at Dec. 31, 2018 |  | 215.2 | 7.5 |  |  |
Beginning balance at Dec. 31, 2018 | 3,140.4 | $ 215.2 | $ (1,015.4) | 1,384.4 | 2,694.7 | (138.5)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income (loss) | 766.7 |  |  |  |  |
Other comprehensive income (loss), net of tax | (17.3) |  |  |  |  |
Ending balance (in shares) at Sep. 30, 2019 |  | 217.5 | 9.0 |  |  |
Ending balance at Sep. 30, 2019 | 3,814.8 | $ 217.5 | $ (1,278.7) | 1,570.4 | 3,461.4 | (155.8)
Beginning balance (in shares) at Mar. 31, 2019 |  | 216.0 | 7.6 |  |  |
Beginning balance at Mar. 31, 2019 | 3,447.5 | $ 216.0 | $ (1,021.1) | 1,449.4 | 2,944.4 | (141.2)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income (loss) | 242.3 |  |  |  | 242.3 |
Other comprehensive income (loss), net of tax | 3.0 |  |  |  |  | 3.0
Common stock issued under equity plans (in shares) |  | 0.9 |  |  |  |
Common stock issued under equity plans | 41.5 | $ 0.9 |  | 40.6 |  |
Stock-based compensation expense | 22.3 |  |  | 22.3 |  |
Purchases of treasury stock (in shares) |  |  | 1.4 |  |  |
Purchases of treasury stock | (256.3) |  | $ (256.3) |  |  |
Ending balance (in shares) at Jun. 30, 2019 |  | 216.9 | 9.0 |  |  |
Ending balance at Jun. 30, 2019 | 3,500.3 | $ 216.9 | $ (1,277.4) | 1,512.3 | 3,186.7 | (138.2)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income (loss) | 274.7 |  |  |  | 274.7 |
Other comprehensive income (loss), net of tax | (17.6) |  |  |  |  | (17.6)
Common stock issued under equity plans (in shares) |  | 0.6 |  |  |  |
Common stock issued under equity plans | 38.9 | $ 0.6 |  | 38.3 |  |
Stock-based compensation expense | 19.8 |  |  | 19.8 |  |
Purchases of treasury stock | (1.3) |  | $ (1.3) |  |  |
Ending balance (in shares) at Sep. 30, 2019 |  | 217.5 | 9.0 |  |  |
Ending balance at Sep. 30, 2019 | 3,814.8 | $ 217.5 | $ (1,278.7) | 1,570.4 | 3,461.4 | (155.8)
Beginning balance (in shares) at Dec. 31, 2019 |  | 218.1 | 9.0 |  |  |
Beginning balance at Dec. 31, 2019 | 4,148.3 | $ 218.1 | $ (1,278.7) | 1,623.3 | 3,741.6 | (156.0)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income (loss) | 310.6 |  |  |  | 310.6 |
Other comprehensive income (loss), net of tax | 4.0 |  |  |  |  | 4.0
Common stock issued under equity plans (in shares) |  | 0.4 |  |  |  |
Common stock issued under equity plans | 29.1 | $ 0.4 |  | 28.7 |  |
Stock-based compensation expense | 23.9 |  |  | 23.9 |  |
Purchases of treasury stock (in shares) |  |  | 3.0 |  |  |
Purchases of treasury stock | (614.8) |  | $ (614.8) |  |  |
Ending balance (in shares) at Mar. 31, 2020 |  | 218.5 | 12.0 |  |  |
Ending balance at Mar. 31, 2020 | 3,901.1 | $ 218.5 | $ (1,893.5) | 1,675.9 | 4,052.2 | (152.0)
Beginning balance (in shares) at Dec. 31, 2019 |  | 218.1 | 9.0 |  |  |
Beginning balance at Dec. 31, 2019 | 4,148.3 | $ 218.1 | $ (1,278.7) | 1,623.3 | 3,741.6 | (156.0)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income (loss) | 513.9 |  |  |  |  |
Other comprehensive income (loss), net of tax | (1.9) |  |  |  |  |
Ending balance (in shares) at Sep. 30, 2020 |  | 635.0 | 12.1 |  |  |
Ending balance at Sep. 30, 2020 | 4,210.3 | $ 635.0 | $ (1,903.9) | 1,381.6 | 4,255.5 | (157.9)
Beginning balance (in shares) at Mar. 31, 2020 |  | 218.5 | 12.0 |  |  |
Beginning balance at Mar. 31, 2020 | 3,901.1 | $ 218.5 | $ (1,893.5) | 1,675.9 | 4,052.2 | (152.0)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income (loss) | (121.9) |  |  |  | (121.9) |
Other comprehensive income (loss), net of tax | 5.9 |  |  |  |  | 5.9
Common stock issued under equity plans (in shares) |  | 1.2 |  |  |  |
Common stock issued under equity plans | 38.2 | $ 1.2 |  | 37.0 |  |
Stock-based compensation expense | 24.8 |  |  | 24.8 |  |
Purchases of treasury stock (in shares) |  |  | 0.1 |  |  |
Purchases of treasury stock | (9.0) |  | $ (9.0) |  |  |
Stock issued to effect stock split (in shares) |  | 413.8 |  |  |  |
Stock issued to effect stock split (Note 1) | 0.0 | $ 413.8 |  | (413.8) |  |
Ending balance (in shares) at Jun. 30, 2020 |  | 633.5 | 12.1 |  |  |
Ending balance at Jun. 30, 2020 | 3,839.1 | $ 633.5 | $ (1,902.5) | 1,323.9 | 3,930.3 | (146.1)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income (loss) | 325.2 |  |  |  | 325.2 |
Other comprehensive income (loss), net of tax | (11.8) |  |  |  |  | (11.8)
Common stock issued under equity plans (in shares) |  | 1.5 |  |  |  |
Common stock issued under equity plans | 36.2 | $ 1.5 |  | 34.7 |  |
Stock-based compensation expense | 23.0 |  |  | 23.0 |  |
Purchases of treasury stock | (1.4) |  | $ (1.4) |  |  |
Ending balance (in shares) at Sep. 30, 2020 |  | 635.0 | 12.1 |  |  |
Ending balance at Sep. 30, 2020 | $ 4,210.3 | $ 635.0 | $ (1,903.9) | $ 1,381.6 | $ 4,255.5 | $ (157.9)

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- Definition Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration