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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) shares in Millions, $ in Millions | Total | Cumulative Effect, Period of Adoption, Adjustment | Additional Paid-in Capital | Retained Earnings | Retained Earnings Cumulative Effect, Period of Adoption, Adjustment | Accumulated Other Comprehensive Income (Loss) | Treasury Stock | Class A Stock | Common Stock
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning Balance (in shares) at Dec. 31, 2018 |  |  |  |  |  |  | (4.0) | 1.9 | 111.1
Beginning Balance at Dec. 31, 2018 | $ 8,757.3 | $ 9.7 | $ 3,911.6 | $ 5,254.3 | $ 9.7 | $ (12.3) | $ (396.4) | $ 0.0 | $ 0.1
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Issuance of Common Stock for equity awards granted under long-term incentive plans (in shares) |  |  |  |  |  |  |  |  | 0.6
Issuance of Common Stock for equity awards granted under long-term incentive plans | 140.9 |  | 140.9 |  |  |  |  |  |
Common Stock tendered upon exercise of stock options and vesting of restricted stock for employee tax obligations | (10.7) |  | (10.7) |  |  |  |  |  |
Issuance/distribution of Common Stock for 401(k) Savings Plan | 10.5 |  | 4.3 |  |  |  | $ 6.2 |  |
Issuance/distribution of Common Stock in connection with 401(k) Savings Plan (in shares) |  |  |  |  |  |  | 0.1 |  |
Repurchases of Common Stock (in shares) |  |  |  |  |  |  | (0.1) |  |
Repurchases of Common Stock | (54.0) |  |  |  |  |  | $ (54.0) |  |
Stock-based compensation charges | 114.8 |  | 114.8 |  |  |  |  |  |
Net income | 461.1 |  |  | 461.1 |  |  |  |  |
Other comprehensive income (loss), net of tax | 15.1 |  |  |  |  | 15.1 |  |  |
Ending Balance (in shares) at Mar. 31, 2019 |  |  |  |  |  |  | (4.0) | 1.9 | 111.7
Ending Balance at Mar. 31, 2019 | 9,444.7 |  | 4,160.9 | 5,725.1 |  | 2.8 | $ (444.2) | $ 0.0 | $ 0.1
Beginning Balance (in shares) at Dec. 31, 2018 |  |  |  |  |  |  | (4.0) | 1.9 | 111.1
Beginning Balance at Dec. 31, 2018 | 8,757.3 | $ 9.7 | 3,911.6 | 5,254.3 | $ 9.7 | (12.3) | $ (396.4) | $ 0.0 | $ 0.1
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Net income | 1,323.8 |  |  |  |  |  |  |  |
Ending Balance (in shares) at Sep. 30, 2019 |  |  |  |  |  |  | (4.2) | 1.8 | 112.1
Ending Balance at Sep. 30, 2019 | 10,504.4 |  | 4,388.4 | 6,587.8 |  | 16.5 | $ (488.4) | $ 0.0 | $ 0.1
Beginning Balance (in shares) at Mar. 31, 2019 |  |  |  |  |  |  | (4.0) | 1.9 | 111.7
Beginning Balance at Mar. 31, 2019 | 9,444.7 |  | 4,160.9 | 5,725.1 |  | 2.8 | $ (444.2) | $ 0.0 | $ 0.1
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Issuance of Common Stock for equity awards granted under long-term incentive plans (in shares) |  |  |  |  |  |  |  |  | 0.3
Issuance of Common Stock for equity awards granted under long-term incentive plans | 13.9 |  | 13.9 |  |  |  |  |  |
Common Stock tendered upon exercise of stock options and vesting of restricted stock for employee tax obligations (in shares) |  |  |  |  |  |  |  |  | (0.1)
Common Stock tendered upon exercise of stock options and vesting of restricted stock for employee tax obligations | (29.7) |  | (29.7) |  |  |  |  |  |
Issuance/distribution of Common Stock for 401(k) Savings Plan | 11.7 |  | 9.3 |  |  |  | $ 2.4 |  |
Stock-based compensation charges | 109.2 |  | 109.2 |  |  |  |  |  |
Net income | 193.1 |  |  | 193.1 |  |  |  |  |
Other comprehensive income (loss), net of tax | 13.0 |  |  |  |  | 13.0 |  |  |
Ending Balance (in shares) at Jun. 30, 2019 |  |  |  |  |  |  | (4.0) | 1.9 | 111.9
Ending Balance at Jun. 30, 2019 | 9,755.9 |  | 4,263.6 | 5,918.2 |  | 15.8 | $ (441.8) | $ 0.0 | $ 0.1
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Issuance of Common Stock for equity awards granted under long-term incentive plans (in shares) |  |  |  |  |  |  |  |  | 0.1
Issuance of Common Stock for equity awards granted under long-term incentive plans | 8.3 |  | 8.3 |  |  |  |  |  |
Common Stock tendered upon exercise of stock options and vesting of restricted stock for employee tax obligations (in shares) |  |  |  |  |  |  |  |  | 0.0
Common Stock tendered upon exercise of stock options and vesting of restricted stock for employee tax obligations | (0.1) |  | (0.1) |  |  |  |  |  |
Issuance/distribution of Common Stock for 401(k) Savings Plan | 6.0 |  | 3.9 |  |  |  | $ 2.1 |  |
Repurchases of Common Stock (in shares) |  |  |  |  |  |  | (0.2) |  |
Repurchases of Common Stock | (48.7) |  |  |  |  |  | $ (48.7) |  |
Stock-based compensation charges | 112.7 |  | 112.7 |  |  |  |  |  |
Net income | 669.6 |  |  | 669.6 |  |  |  |  |
Other comprehensive income (loss), net of tax | 0.7 |  |  |  |  | 0.7 |  |  |
Conversion of Class A Stock to Common Stock (in shares) |  |  |  |  |  |  |  | (0.1) | 0.1
Conversion of Class A Stock to Common Stock | 0.0 |  |  |  |  |  |  |  |
Ending Balance (in shares) at Sep. 30, 2019 |  |  |  |  |  |  | (4.2) | 1.8 | 112.1
Ending Balance at Sep. 30, 2019 | 10,504.4 |  | 4,388.4 | 6,587.8 |  | 16.5 | $ (488.4) | $ 0.0 | $ 0.1
Beginning Balance (in shares) at Dec. 31, 2019 |  |  |  |  |  |  | (4.9) | 1.8 | 113.3
Beginning Balance at Dec. 31, 2019 | 11,089.7 |  | 4,428.6 | 7,379.8 |  | 21.1 | $ (739.9) | $ 0.0 | $ 0.1
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Issuance of Common Stock for equity awards granted under long-term incentive plans (in shares) |  |  |  |  |  |  |  |  | 3.1
Issuance of Common Stock for equity awards granted under long-term incentive plans | 817.4 |  | 817.4 |  |  |  |  |  |
Common Stock tendered upon exercise of stock options and vesting of restricted stock for employee tax obligations (in shares) |  |  |  |  |  |  |  |  | (0.4)
Common Stock tendered upon exercise of stock options and vesting of restricted stock for employee tax obligations | (155.1) |  | (155.1) |  |  |  |  |  |
Issuance/distribution of Common Stock for 401(k) Savings Plan | 14.6 |  | 12.5 |  |  |  | $ 2.1 |  |
Issuance/distribution of Common Stock in connection with 401(k) Savings Plan (in shares) |  |  |  |  |  |  | 0.0 |  |
Repurchases of Common Stock (in shares) |  |  |  |  |  |  | (0.8) |  |
Repurchases of Common Stock | (336.0) |  |  |  |  |  | $ (336.0) |  |
Stock-based compensation charges | 108.0 |  | 108.0 |  |  |  |  |  |
Net income | 624.6 |  |  | 624.6 |  |  |  |  |
Other comprehensive income (loss), net of tax | (30.2) |  |  |  |  | (30.2) |  |  |
Ending Balance (in shares) at Mar. 31, 2020 |  |  |  |  |  |  | (5.7) | 1.8 | 116.0
Ending Balance at Mar. 31, 2020 | 12,133.0 |  | 5,211.4 | 8,004.4 |  | (9.1) | $ (1,073.8) | $ 0.0 | $ 0.1
Beginning Balance (in shares) at Dec. 31, 2019 |  |  |  |  |  |  | (4.9) | 1.8 | 113.3
Beginning Balance at Dec. 31, 2019 | 11,089.7 |  | 4,428.6 | 7,379.8 |  | 21.1 | $ (739.9) | $ 0.0 | $ 0.1
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Net income | 2,364.0 |  |  |  |  |  |  |  |
Ending Balance (in shares) at Sep. 30, 2020 |  |  |  |  |  |  | (15.7) | 1.8 | 120.5
Ending Balance at Sep. 30, 2020 | 10,125.5 |  | 6,592.8 | 9,743.8 |  | 30.8 | $ (6,242.0) | $ 0.0 | $ 0.1
Beginning Balance (in shares) at Mar. 31, 2020 |  |  |  |  |  |  | (5.7) | 1.8 | 116.0
Beginning Balance at Mar. 31, 2020 | 12,133.0 |  | 5,211.4 | 8,004.4 |  | (9.1) | $ (1,073.8) | $ 0.0 | $ 0.1
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Issuance of Common Stock for equity awards granted under long-term incentive plans (in shares) |  |  |  |  |  |  |  |  | 4.4
Issuance of Common Stock for equity awards granted under long-term incentive plans | 1,355.5 |  | 1,355.5 |  |  |  |  |  |
Common Stock tendered upon exercise of stock options and vesting of restricted stock for employee tax obligations (in shares) |  |  |  |  |  |  |  |  | (0.6)
Common Stock tendered upon exercise of stock options and vesting of restricted stock for employee tax obligations | (416.5) |  | (416.5) |  |  |  |  |  |
Issuance/distribution of Common Stock for 401(k) Savings Plan | 10.1 |  | 7.4 |  |  |  | $ 2.7 |  |
Issuance/distribution of Common Stock in connection with 401(k) Savings Plan (in shares) |  |  |  |  |  |  | 0.0 |  |
Repurchases of Common Stock (in shares) |  |  |  |  |  |  | (9.9) |  |
Repurchases of Common Stock | (5,071.8) |  |  |  |  |  | $ (5,071.8) |  |
Stock-based compensation charges | 105.2 |  | 105.2 |  |  |  |  |  |
Net income | 897.3 |  |  | 897.3 |  |  |  |  |
Other comprehensive income (loss), net of tax | 44.6 |  |  |  |  | 44.6 |  |  |
Ending Balance (in shares) at Jun. 30, 2020 |  |  |  |  |  |  | (15.6) | 1.8 | 119.8
Ending Balance at Jun. 30, 2020 | 9,057.4 |  | 6,263.0 | 8,901.7 |  | 35.5 | $ (6,142.9) | $ 0.0 | $ 0.1
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Issuance of Common Stock for equity awards granted under long-term incentive plans (in shares) |  |  |  |  |  |  |  |  | 0.9
Issuance of Common Stock for equity awards granted under long-term incentive plans | 297.5 |  | 297.5 |  |  |  |  |  |
Common Stock tendered upon exercise of stock options and vesting of restricted stock for employee tax obligations (in shares) |  |  |  |  |  |  |  |  | (0.2)
Common Stock tendered upon exercise of stock options and vesting of restricted stock for employee tax obligations | (80.9) |  | (80.9) |  |  |  |  |  |
Issuance/distribution of Common Stock for 401(k) Savings Plan | 9.9 |  | 8.6 |  |  |  | $ 1.3 |  |
Issuance/distribution of Common Stock in connection with 401(k) Savings Plan (in shares) |  |  |  |  |  |  | 0.0 |  |
Repurchases of Common Stock (in shares) |  |  |  |  |  |  | (0.1) |  |
Repurchases of Common Stock | (100.4) |  |  |  |  |  | $ (100.4) |  |
Stock-based compensation charges | 104.6 |  | 104.6 |  |  |  |  |  |
Net income | 842.1 |  |  | 842.1 |  |  |  |  |
Other comprehensive income (loss), net of tax | (4.7) |  |  |  |  | (4.7) |  |  |
Ending Balance (in shares) at Sep. 30, 2020 |  |  |  |  |  |  | (15.7) | 1.8 | 120.5
Ending Balance at Sep. 30, 2020 | $ 10,125.5 |  | $ 6,592.8 | $ 9,743.8 |  | $ 30.8 | $ (6,242.0) | $ 0.0 | $ 0.1

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