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Stockholders' Equity and Noncontrolling Interests (Tables) | 3 Months Ended
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Mar. 31, 2024
Stockholders' Equity and Noncontrolling Interests |
Rollforward of consolidated changes in equity | A rollforward of consolidated changes in equity and redeemable noncontrolling interests for the three months ended March 31, 2024 is as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Stockholders’ equity attributable to Amphenol Corporation | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Accumulated | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Redeemable
​ |  | Common Stock | ​ | Treasury Stock | ​ | Additional | ​ | ​ | ​ | ​ | Other | ​ | Non- | ​ | ​ | ​ | ​ | Non-
​ |  | Shares | ​ | ​ | ​ | ​ | Shares | ​ | ​ | ​ | ​ | Paid-In | ​ | Retained | ​ | Comprehensive | ​ | controlling | ​ | Total | ​ | controlling
​ |  | (in millions) |  | Amount |  | (in millions) |  | Amount |  | Capital |  | Earnings |  | Loss |  | Interests (1) |  | Equity |  | Interests
​ |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance as of December 31, 2023 |  | 600.6 |  | $ | 0.6 |  | (1.7) |  | $ | (142.8) |  | $ | 3,101.2 |  | $ | 5,921.1 |  | $ | (533.6) |  | $ | 49.3 |  | $ | 8,395.8 |  | $ | 30.7
Net income |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | 548.7 | ​ | ​ | ​ | ​ |  | 2.9 | ​ |  | 551.6 | ​ | ​ | 0.4
Other comprehensive income (loss) |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | (69.3) | ​ |  | (0.8) | ​ |  | (70.1) | ​ | ​ | (0.2)
Capital contributions from noncontrolling interests |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | 0.8 | ​ |  | 0.8 | ​ | ​ | ​
Purchase of treasury stock |  | ​ | ​ | ​ | ​ | ​ | (1.4) | ​ |  | (153.8) | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | (153.8) | ​ | ​ | ​
Retirement of treasury stock |  | (1.4) | ​ | ​ | — | ​ | 1.4 | ​ |  | 153.8 | ​ | ​ | ​ | ​ |  | (153.8) | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | — | ​ | ​ | ​
Stock options exercised |  | 2.8 | ​ | ​ | — | ​ | 0.4 | ​ | ​ | 39.0 | ​ |  | 99.1 | ​ | ​ | (20.4) | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | 117.7 | ​ | ​ | ​
Dividends declared ($0.22 per common share) |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | (132.1) | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | (132.1) | ​ | ​ | ​
Stock-based compensation expense |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | 23.8 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | 23.8 | ​ | ​ | ​
Balance as of March 31, 2024 |  | 602.0 | ​ | $ | 0.6 | ​ | (1.3) | ​ | $ | (103.8) | ​ | $ | 3,224.1 | ​ | $ | 6,163.5 | ​ | $ | (602.9) | ​ | $ | 52.2 | ​ | $ | 8,733.7 | ​ | $ | 30.9
(1) Excludes redeemable noncontrolling interests. ​ A rollforward of consolidated changes in equity and redeemable noncontrolling interests for the three months ended March 31, 2023 is as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Stockholders’ equity attributable to Amphenol Corporation | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Accumulated | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Redeemable
​ |  | Common Stock | ​ | Treasury Stock | ​ | Additional | ​ | ​ | ​ | ​ | Other | ​ | Non- | ​ | ​ | ​ | ​ | Non-
​ |  | Shares | ​ | ​ | ​ | ​ | Shares | ​ | ​ | ​ | ​ | Paid-In | ​ | Retained | ​ | Comprehensive | ​ | controlling | ​ | Total | ​ | controlling
​ |  | (in millions) |  | Amount |  | (in millions) |  | Amount |  | Capital |  | Earnings |  | Loss |  | Interests (1) |  | Equity |  | Interests
​ |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance as of December 31, 2022 |  | 596.0 |  | $ | 0.6 |  | (1.2) |  | $ | (79.8) |  | $ | 2,650.4 |  | $ | 4,979.4 |  | $ | (535.0) |  | $ | 57.9 |  | $ | 7,073.5 |  | $ | 20.6
Net income |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | 439.2 | ​ | ​ | ​ | ​ |  | 3.2 | ​ |  | 442.4 | ​ |  | 0.3
Other comprehensive income (loss) |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | 42.4 | ​ |  | 0.8 | ​ |  | 43.2 | ​ |  | —
Acquisitions resulting in noncontrolling interests |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | 0.8 | ​ |  | 0.8 | ​ |  | ​
Distributions to shareholders of noncontrolling interests |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | (5.2) | ​ |  | (5.2) | ​ |  | ​
Purchase of treasury stock |  | ​ | ​ | ​ | ​ | ​ | (2.1) | ​ |  | (166.9) | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | (166.9) | ​ |  | ​
Retirement of treasury stock |  | (2.1) | ​ | ​ | — | ​ | 2.1 | ​ |  | 166.9 | ​ | ​ | ​ | ​ |  | (166.9) | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | — | ​ |  | ​
Stock options exercised |  | 2.4 | ​ | ​ | — | ​ | 0.2 | ​ | ​ | 10.1 | ​ |  | 76.4 | ​ | ​ | (5.4) | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | 81.1 | ​ |  | ​
Dividends declared ($0.21 per common share) |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | (125.0) | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | (125.0) | ​ |  | ​
Stock-based compensation expense |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | 21.7 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |  | 21.7 | ​ |  | ​
Balance as of March 31, 2023 |  | 596.3 | ​ | $ | 0.6 | ​ | (1.0) | ​ | $ | (69.7) | ​ | $ | 2,748.5 | ​ | $ | 5,121.3 | ​ | $ | (492.6) | ​ | $ | 57.5 | ​ | $ | 7,365.6 | ​ | $ | 20.9
(1) Excludes redeemable noncontrolling interests. ​ ​
Schedules of dividends | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended March 31, | ​
​ |  | 2024 | ​ | 2023 | ​
Dividends declared | ​ | $ | 132.1 | ​ | $ | 125.0 | ​
Dividends paid (including those declared in the prior year) | ​ |  | 131.7 | ​ |  | 124.9 | ​

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