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Earnings Per Share | 3 Months Ended
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Dec. 31, 2017
Earnings Per Share [Abstract] |
Earnings Per Share | Earnings Per Share The Company presents both basic and diluted earnings per share ("EPS") amounts. Basic EPS is calculated by dividing net income attributable to Johnson Controls by the weighted average number of ordinary shares outstanding during the reporting period. Diluted EPS is calculated by dividing net income attributable to Johnson Controls by the weighted average number of ordinary shares and ordinary equivalent shares outstanding during the reporting period that are calculated using the treasury stock method for stock options, unvested restricted stock and unvested performance share awards. The treasury stock method assumes that the Company uses the proceeds from the exercise of stock option awards to repurchase ordinary shares at the average market price during the period. The assumed proceeds under the treasury stock method include the purchase price that the grantee will pay in the future and compensation cost for future service that the Company has not yet recognized. For unvested restricted stock and unvested performance share awards, assumed proceeds under the treasury stock method would include unamortized compensation cost. The following table reconciles the numerators and denominators used to calculate basic and diluted earnings per share (in millions):
| Three Months Ended December 31,
| 2017 |  | 2016
Income Available to Ordinary Shareholders |  |  |
Income from continuing operations | $ | 230 |  |  | $ | 372 |
Loss from discontinued operations | — |  |  | (43 | )
Basic and diluted income available to shareholders | $ | 230 |  |  | $ | 329 |
Weighted Average Shares Outstanding |  |  |
Basic weighted average shares outstanding | 926.1 |  |  | 937.2 |
Effect of dilutive securities: |  |  |
Stock options, unvested restricted stock and unvested performance share awards | 7.2 |  |  | 10.2 |
Diluted weighted average shares outstanding | 933.3 |  |  | 947.4 |
Antidilutive Securities |  |  |
Options to purchase shares | 1.0 |  |  | 0.1 |
During the three months ended December 31, 2017 and 2016, the Company declared a dividend of $0.26 and $0.25, respectively, per share. The Company paid all dividends in the month subsequent to the end of each fiscal quarter.

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