Fair Value Measurements (Assets Held-for-Sale) (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset impairment	$ 0	$ 0	$ 1,884,000	$ 0	$ 87,200,000
Assets held for sale	50,000,000		50,000,000		50,000,000
Liabilities measured on nonrecurring basis	0		0		0
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Property and equipment, net	50,000,000		50,000,000		50,000,000
Goodwill allocated to sale of business	0		0		0
Assets held for sale	50,000,000		50,000,000		50,000,000
Cognizant Technology Solutions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Goodwill allocated to sale of business	0		0		0
Property, Plant and Equipment [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset impairment	0		1,900,000		80,200,000
Property, Plant and Equipment [Member] | Cognizant Technology Solutions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset impairment			1,900,000		80,200,000
Goodwill [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset impairment	$ 0		0		7,000,000
Goodwill [Member] | Cognizant Technology Solutions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset impairment			$ 0		$ 7,000,000