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Capital Stock | 12 Months Ended
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Dec. 31, 2017
Stockholders Equity Note [Abstract] |
Capital Stock | Note 9 — Capital Stock Common Stock Outstanding Common stock outstanding as of December 31, 2017, 2016 and 2015 was as follows:
(Number of shares in millions) |  | 2017 |  |  | 2016 |  |  | 2015 |
Common stock: |  |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of year |  | 106.7 |  |  |  | 106.0 |  |  | 104.8 |
Activity under stock plans |  | 1.1 |  |  | 0.7 |  |  | 1.2 |
Balance, end of year |  | 107.8 |  |  | 106.7 |  |  |  | 106.0 |
Treasury stock: |  |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of year |  | 15.3 |  |  | 12.5 |  |  | 9.3 |
Repurchased |  |  | 2.9 |  |  | 2.8 |  |  | 3.2 |
Balance, end of year |  | 18.2 |  |  | 15.3 |  |  | 12.5 |
Common stock outstanding |  | 89.6 |  |  | 91.4 |  |  | 93.5 |
In June 2014, our Board authorized a plan to repurchase $150 million of our outstanding common stock (“2014 Repurchase Plan”). In October 2015, our Board authorized the repurchase of $250 million of the Company’s common stock. During February of 2017, the Board authorized the repurchase on an additional $300 million of the Company’s common stock of which $242.5 million is still available at December 31, 2017. During 2017, 2016 and 2015, the Company spent $150.3 million, $111.1 million, and $146.1 million to repurchase common stock under its repurchase programs. During 2017 the Company paid $42.6 million in dividends on its common stock. Dividends per share of common stock for 2017, 2016, and 2015, were $0.47, $0.44, and $0.40, respectively.

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- Definition The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI http://asc.fasb.org/topic&trid=2208762 + Details
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