Fair Value Measurements (Assets Held-for-Sale) (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset impairment	$ 0	$ 84,690,000	$ 1,884,000	$ 84,690,000	$ 87,200,000
Assets held for sale	0		0		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	0		0		50,000,000
Goodwill allocated to sale of business	0		0		0
Assets held for sale	0		0		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	77,700,000	1,900,000	77,700,000	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	$ 7,000,000	0	$ 7,000,000	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