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Stockholders' Equity | 12 Months Ended
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Dec. 31, 2014
Stockholders' Equity Note [Abstract] |
Stockholders' Equity | Stockholders' Equity Preferred Stock The Company is authorized to issue up to 5.0 million shares of Preferred Stock. Any such Preferred Stock issued by the Company may rank prior to common stock as to dividend rights, liquidation preference or both, may have full or limited voting rights and may be convertible into shares of common stock. Common Stock The Company's Board of Directors has authorized the issuance of up to 150.0 million shares of Voting Common Stock and 3.0 million shares of Class B Non-Voting Common Stock. As more fully described in Note 8, the Company is party to a forward equity sale agreement to issue new shares of the Company's common stock. The Company's Board of Directors has also authorized share repurchase programs in recent periods. As of December 31, 2014, there were approximately 1.0 million remaining shares available for repurchase under outstanding programs. The timing and amount of issuances and repurchases are determined at the discretion of AMG's management. A summary of the Company's recent share repurchase activity is as follows:
Period |  | Shares Repurchased |  | Average Price
2012 |  | 0.6 |  |  | $ | 107.44 |
2013 |  | 0.1 |  |  | 184.89 |
2014 |  | 1.2 |  |  | 204.72 |
The Company has repurchased an additional 0.3 million shares from January 1 through February 18, 2015. Financial Instruments The Company's junior convertible securities contain an embedded right for holders to receive shares of the Company's common stock under certain conditions. These arrangements, as well as the forward equity sale agreement, meet the definition of equity and are not required to be accounted for separately as derivative instruments.

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- Definition Disclosures related to accounts comprising shareholder's equity, excluding other comprehensive income, specific to preferred stock, common stock, financial instruments, and stock options and incentive plans. + References No definition available. + Details
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