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Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($) shares in Millions, $ in Millions | Total | Common Stock Class A | Common Stock Class B | Additional Paid-In Capital | Accumulated Other Comprehensive Loss | Retained Earnings
--- | --- | --- | --- | --- | --- | ---
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Retained Earnings Adjustment for Adoption of ASC | $ 1.4 |  |  |  |  | $ 1.4
Balance (in shares) at Dec. 31, 2017 |  | 23.9 | 1.0 |  |  |
Balance at Dec. 31, 2017 | 1,083.2 | $ 149.1 | $ 0.1 | $ 11.3 | $ 0.0 | 922.7
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 52.1 |  |  |  |  | 52.1
Issuance of stock in connection with employee stock plans | 1.8 | $ 1.8 |  |  |  |
Issuance of restricted stock to employees (in shares) |  | 0.1 |  |  |  |
Issuance of restricted stock to employees | 0.0 | $ 0.0 |  |  |  |
Repurchase of Class A common stock (in shares) |  | (0.1) |  |  |  |
Repurchase of Class A common stock | (8.2) | $ (8.2) |  |  |  |
Compensation for stock and stock option issuances and excess tax benefits from option exercises | 3.6 | $ 0.3 |  | 3.3 |  |
Dividends paid | (6.8) |  |  |  |  | (6.8)
Balance (in shares) at Mar. 31, 2018 |  | 23.9 | 1.0 |  |  |
Balance at Mar. 31, 2018 | 1,127.1 | $ 143.0 | $ 0.1 | 14.6 | 0.0 | 969.4
Balance (in shares) at Dec. 31, 2017 |  | 23.9 | 1.0 |  |  |
Balance at Dec. 31, 2017 | 1,083.2 | $ 149.1 | $ 0.1 | 11.3 | 0.0 | 922.7
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 205.8 |  |  |  |  |
Loss on cash flow hedges, net of tax benefit | 0.0 |  |  |  |  |
Balance (in shares) at Sep. 30, 2018 |  | 22.9 | 1.0 |  |  |
Balance at Sep. 30, 2018 | 1,205.1 | $ 50.1 | $ 0.1 | 45.9 | 0.0 | 1,109.0
Balance (in shares) at Mar. 31, 2018 |  | 23.9 | 1.0 |  |  |
Balance at Mar. 31, 2018 | 1,127.1 | $ 143.0 | $ 0.1 | 14.6 | 0.0 | 969.4
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 60.7 |  |  |  |  | 60.7
Issuance of stock in connection with employee stock plans (in shares) |  | 0.1 |  |  |  |
Issuance of stock in connection with employee stock plans | 2.7 | $ 2.7 |  |  |  |
Repurchase of Class A common stock (in shares) |  | (0.6) |  |  |  |
Repurchase of Class A common stock | (59.1) | $ (59.1) |  |  |  |
Compensation for stock and stock option issuances and excess tax benefits from option exercises | 3.3 | $ 7.8 |  | (4.5) |  |
Option premiums received (paid) | 33.4 |  |  | 33.4 |  |
Dividends paid | (7.2) |  |  |  |  | (7.2)
Balance (in shares) at Jun. 30, 2018 |  | 23.4 | 1.0 |  |  |
Balance at Jun. 30, 2018 | 1,160.9 | $ 94.4 | $ 0.1 | 43.5 | 0.0 | 1,022.9
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 93.1 |  |  |  |  | 93.1
Loss on cash flow hedges, net of tax benefit | 0.0 |  |  |  |  |
Issuance of stock in connection with employee stock plans | 2.9 | $ 2.9 |  |  |  |
Repurchase of Class A common stock (in shares) |  | (0.5) |  |  |  |
Repurchase of Class A common stock | (47.7) | $ (47.7) |  |  |  |
Compensation for stock and stock option issuances and excess tax benefits from option exercises | 2.9 | $ 0.5 |  | 2.4 |  |
Dividends paid | (7.0) |  |  |  |  | (7.0)
Balance (in shares) at Sep. 30, 2018 |  | 22.9 | 1.0 |  |  |
Balance at Sep. 30, 2018 | 1,205.1 | $ 50.1 | $ 0.1 | 45.9 | 0.0 | 1,109.0
Balance (in shares) at Dec. 31, 2018 |  | 22.0 | 1.0 |  |  |
Balance at Dec. 31, 2018 | 1,197.2 | $ 0.0 | $ 0.1 | 35.0 | 0.0 | 1,162.1
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 56.4 |  |  |  |  | 56.4
Issuance of stock in connection with employee stock plans | 2.3 | $ 2.3 |  |  |  |
Issuance of restricted stock to employees (in shares) |  | 0.1 |  |  |  |
Issuance of restricted stock to employees | 0.0 |  |  |  |  |
Repurchase of Class A common stock | (3.1) | $ (3.1) |  |  |  |
Class B common stock converted to Class A common stock (in shares) |  | 0.2 | (0.2) |  |  |
Class B common stock converted to Class A common stock | 0.0 |  |  |  |  |
Compensation for stock and stock option issuances and excess tax benefits from option exercises | 3.5 | $ 10.5 |  | (7.0) |  |
Dividends paid | (6.7) |  |  |  |  | (6.7)
Balance (in shares) at Mar. 31, 2019 |  | 22.3 | 0.8 |  |  |
Balance at Mar. 31, 2019 | 1,250.5 | $ 9.7 | $ 0.1 | 28.0 | 0.0 | 1,212.7
Balance (in shares) at Dec. 31, 2018 |  | 22.0 | 1.0 |  |  |
Balance at Dec. 31, 2018 | 1,197.2 | $ 0.0 | $ 0.1 | 35.0 | 0.0 | 1,162.1
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 203.5 |  |  |  |  |
Loss on cash flow hedges, net of tax benefit | (1.9) |  |  |  |  |
Balance (in shares) at Sep. 30, 2019 |  | 22.6 | 0.6 |  |  |
Balance at Sep. 30, 2019 | 1,359.2 | $ 16.9 | $ 0.1 | 3.4 | (1.9) | 1,340.7
Balance (in shares) at Mar. 31, 2019 |  | 22.3 | 0.8 |  |  |
Balance at Mar. 31, 2019 | 1,250.5 | $ 9.7 | $ 0.1 | 28.0 | 0.0 | 1,212.7
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 61.9 |  |  |  |  | 61.9
Loss on cash flow hedges, net of tax benefit | (0.9) |  |  |  | (0.9) |
Issuance of stock in connection with employee stock plans (in shares) |  | 0.1 |  |  |  |
Issuance of stock in connection with employee stock plans | 2.8 | $ 2.8 |  |  |  |
Compensation for stock and stock option issuances and excess tax benefits from option exercises | 3.9 | $ 0.5 |  | 3.4 |  |
Option premiums received (paid) | (36.5) |  |  | (31.4) |  | (5.1)
Dividends paid | (7.0) |  |  |  |  | (7.0)
Balance (in shares) at Jun. 30, 2019 |  | 22.4 | 0.8 |  |  |
Balance at Jun. 30, 2019 | 1,274.7 | $ 13.0 | $ 0.1 | 0.0 | (0.9) | 1,262.5
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 85.2 |  |  |  |  | 85.2
Loss on cash flow hedges, net of tax benefit | (1.0) |  |  |  | (1.0) |
Issuance of stock in connection with employee stock plans | 2.9 | $ 2.9 |  |  |  |
Class B common stock converted to Class A common stock (in shares) |  | 0.2 | (0.2) |  |  |
Class B common stock converted to Class A common stock | 0.0 |  |  |  |  |
Compensation for stock and stock option issuances and excess tax benefits from option exercises | 4.4 | $ 1.0 |  | 3.4 |  |
Dividends paid | (7.0) |  |  |  |  | (7.0)
Balance (in shares) at Sep. 30, 2019 |  | 22.6 | 0.6 |  |  |
Balance at Sep. 30, 2019 | $ 1,359.2 | $ 16.9 | $ 0.1 | $ 3.4 | $ (1.9) | $ 1,340.7

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- Definition Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 4.E) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(31)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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