Significant Accounting Policies (Details 2)	12 Months Ended
	Dec. 31, 2012 Y
Buildings
Property and equipment
Useful life, minimum (in years)	30
Useful life, maximum (in years)	40
Data processing equipment
Property and equipment
Useful life, minimum (in years)	3
Useful life, maximum (in years)	5
Furniture, fixtures and other equipment
Property and equipment
Useful life, minimum (in years)	3
Useful life, maximum (in years)	5
Data processing software
Property and equipment
Useful life, minimum (in years)	3
Useful life, maximum (in years)	5
Large printing and inserting equipment | Customer Communications
Property and equipment
Useful life, minimum (in years)	5
Useful life, maximum (in years)	7
Purchased software
Property and equipment
Useful life, minimum (in years)	3
Useful life, maximum (in years)	5
Capitalized software development costs for internal use
Property and equipment
Useful life, minimum (in years)	3
Useful life, maximum (in years)	5
Capitalized software development costs for sale or license to third parties
Property and equipment
Useful life, minimum (in years)	3
Useful life, maximum (in years)	5