XML 70 R40.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Convertible Securities (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2013
Debt Disclosure [Abstract] |
Schedule of carrying amount and fair value of convertible notes | The carrying values of the Company's convertible securities are as follows:
| December 31, 2012 |  | December 31, 2013
| Carrying Value |  | Principal amount at maturity |  | Carrying Value |  | Principal amount at maturity
Senior convertible securities: |  |  |  |  |  |  |
2008 senior convertible notes(1) | $ | 450.1 |  |  | $ | 460.0 |  |  | $ | — |  |  | $ | — |
Junior convertible trust preferred securities: |  |  |  |  |  |  |
2007 junior convertible trust preferred securities(1) | $ | 299.4 |  |  | $ | 430.8 |  |  | $ | 301.2 |  |  | $ | 430.8 |
2006 junior convertible trust preferred securities(1) | 216.1 |  |  | 300.0 |  |  | 217.5 |  |  | 300.0 |
Total junior convertible securities | $ | 515.5 |  |  | $ | 730.8 |  |  | $ | 518.7 |  |  | $ | 730.8 |
_______________________________________________________________________________
(1) | Carrying value is accreted to the principal amount at maturity over an expected life of 30 years for each of the junior convertible trust preferred securities.
Schedule of principal terms of convertible notes | The principal terms of these securities are summarized below.
| 2006 Junior Convertible Trust Preferred Securities(1) |  | 2007 Junior Convertible Trust Preferred Securities(2)
Issue date | April 2006 |  |  | October 2007 |
Maturity date | April 2036 |  |  | October 2037 |
Par value (in millions) | $ | 300.0 |  |  | $ | 430.8 |
Carrying value (in millions)(3) | $ | 217.5 |  |  | $ | 301.2 |
Denomination | $ | 50 |  |  | $ | 50 |
Current conversion rate | 0.333 |  |  | 0.250 |
Current conversion price | $ | 150.00 |  |  | $ | 200.00 |
Stated coupon | 5.10 | % |  | 5.15 | %
Coupon frequency | Quarterly |  |  | Quarterly |
Tax deduction rate(4) | 7.50 | % |  | 8.00 | %
_______________________________________________________________________________
(1) | On February 13, 2014, we delivered a notice to redeem all of our outstanding 2006 convertible trust preferred securities. In lieu of redemption, holders of the 2006 junior convertible trust preferred securities may elect to convert their securities into a defined number of shares. Upon conversion, holders will receive cash or shares of our common stock, or a combination thereof, at our election.
(2) | The Company may redeem the 2007 junior convertible trust preferred securities if the closing price of the Company's common stock exceeds $260 per share for 20 trading days in a period of 30 consecutive trading days.
(3) | The carrying value is accreted to the principal amount at maturity over an expected life of 30 years for each of the junior convertible trust preferred securities.
(4) | These convertible securities are considered contingent payment debt instruments under federal income tax regulations, which require the Company to deduct interest in an amount greater than its reported Interest expense. These deductions result in annual deferred tax liabilities of approximately $12.9 million ($8.1 million assuming the redemption of the 2006 convertible trust preferred securities). These deferred tax liabilities will be reclassified directly to stockholders' equity if the Company's common stock is trading above certain thresholds at the time of the conversion of the securities. In 2013 , $50.6 million was reclassified to stockholders' equity related to the repurchase of the 2008 senior convertible notes.

X
- Definition Tabular disclosure of the carrying amount and fair value of convertible securities. + References No definition available. + Details
Name: | amg_ScheduleOfConvertibleSecuritiesTableTextBlock
Namespace Prefix: | amg_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of principal terms of convertible securities. + References No definition available. + Details
Name: | amg_ScheduleOfPrincipalTermsOfConvertibleSecuritiesTableTextBlock
Namespace Prefix: | amg_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_DebtDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration