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Component: (Network and Table)
Network
2423408 - Disclosure - Income Taxes - Schedule of Changes in Unrecognized Tax Benefits (Details)
(http://www.amg.com/role/IncomeTaxesScheduleOfChangesInUnrecognizedTaxBenefitsDetails)
Table(Implied)
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0001004434 (http://www.sec.gov/CIK)
Income Tax Disclosure [Abstract]Period [Axis]
2016-01-01 - 2016-12-31
2015-01-01 - 2015-12-31
2014-01-01 - 2014-12-31
Income Tax Disclosure [Abstract]
 
 
 
Reconciliation of beginning and ending amount of unrecognized tax benefits
 
 
 
Beginning balance
26,900,000  
28,800,000  
20,400,000  
Additions based on current year tax positions
3,800,000  
2,200,000  
2,600,000  
Additions based on prior years’ tax positions
600,000  
1,600,000  
10,800,000  
Reductions related to lapses of statutes of limitations
(4,700,000) 
(4,300,000) 
(4,100,000) 
Additions (reductions) related to foreign exchange rates
(200,000) 
1,400,000  
900,000  
Ending balance
26,800,000  
 
26,900,000  
 
28,800,000