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Capital Stock | 12 Months Ended
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Dec. 31, 2017
Equity [Abstract] |
Capital Stock | Capital Stock Common Stock: The Company is authorized to issue 800,000,000 shares of common stock of $0.01 par value. There were 168.1 million and 175.9 million common shares outstanding as of December 31, 2017 and 2016, respectively. During 2016, the Company retired 165.0 million shares of its treasury stock. During 2017, the Company repurchased 8.8 million shares of its common stock at a weighted-average price of $53. This includes 0.2 million shares of common stock that were repurchased from employees that surrendered stock to satisfy withholding taxes in connection with the vesting of restricted stock awards. The remaining repurchases were made pursuant to the following authorizations (in millions of shares):
|  | Shares Repurchased |  | Authorization Remaining at December 31, 2017
Board of Directors’ Authorization |  | 2017 |  | 2016 |  | 2015 |
1997 Authorization |  | — |  |  | — |  |  | 0.9 |  |  | — |
2007 Authorization |  | — |  |  | — |  |  | 0.9 |  |  | — |
2014 Authorization |  | — |  |  | — |  |  | 20.0 |  |  | — |
2015 Authorization |  | — |  |  | 9.0 |  |  | 6.0 |  |  | — |
2016 Authorization |  | 8.7 |  |  | 0.7 |  |  | — |  |  | 10.6 |
Total |  | 8.7 |  |  | 9.7 |  |  | 27.8 |  |  | 10.6 |
1997 Authorization – The Company had an authorization from its Board of Directors (originally adopted December 1997) to repurchase shares of its outstanding common stock under which the cumulative number of shares repurchased, at the time of any repurchase, shall not exceed the sum of (1) the number of shares issued in connection with the exercise of stock options occurring on or after January 1, 2004, and (2) 1% of the issued and outstanding common stock of the Company on January 1 of the current year, adjusted for any stock split. 2007 Authorization – In December 2007, the Company’s Board of Directors separately authorized the Company to buy back up to 20.0 million shares of its common stock with no dollar limit or expiration date. 2014 Authorization – In February 2014, the Company’s Board of Directors separately authorized the Company to buy back up to 20.0 million shares of its common stock with no dollar limit or expiration date. 2015 Authorization – In June 2015, the Company’s Board of Directors separately authorized the Company to buy back up to 15.0 million shares of its common stock with no dollar limit or expiration date. 2016 Authorization – In February 2016, the Company’s Board of Directors separately authorized the Company to buy back up to 20.0 million shares of its common stock with no dollar limit or expiration date. Preferred Stock: The Company is authorized to issue 2,000,000 shares of preferred stock of $1.00 par value, none of which is outstanding.

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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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