Business Acquisitions (Details) (USD $)			9 Months Ended		9 Months Ended		3 Months Ended	9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013 Mha Acquisition [Member]	May 01, 2013 Mha Acquisition [Member]	Sep. 30, 2013 Mha Acquisition [Member] Customer Relationships [Member]	Sep. 30, 2013 Mha Acquisition [Member] Unpatented Technology [Member]	Sep. 30, 2012 Sunquest Acquisition [Member]	Sep. 30, 2012 Sunquest Acquisition [Member]
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition			May 01, 2013					Aug. 22, 2012
Payments to Acquire Businesses, Gross			$ 1,000,000,000
Business Acquisition, Percentage of Voting Interests Acquired			100.00%				100.00%	100.00%
Name of Acquired Entity			Managed Health Care Associates, Inc. ("MHA")					Sunquest Information Systems, Inc. ("Sunquest")
Description of Acquired Entity			MHA is a leading provider of services and technologies to support the diverse and complex needs of alternate site health care providers who deliver services outside of an acute care hospital setting. The acquisition of MHA complements and expands the Company's medical platform. MHA is reported in the Medical & Scientific Imaging segment.
Reason for Business Combination			The acquisition of MHA complements and expands the Company's medical platform.
Cost of Acquired Entity Transaction Costs			2,500,000
Business Combination, Admin Fee Receivables [Abstract]
Business Combination, Acquired Receivables, Description			The fair value of current assets acquired also includes an adjustment of $35.0 million for administrative fees related to customer purchases that occurred prior to the acquisition date but not reported to MHA until after the acquisition date. In the ordinary course, these administrative fees are recorded as revenue when reported; however, GAAP accounting for business acquisitions requires the Company to estimate the amount of purchases occurring prior to the acquisition date and record the fair value of the administrative fees to be received from those purchases as an accounts receivable at the date of acquisition.
Business Combination, Liability Related to Acquired Receivables, Description			The Company also recorded a fair value liability of $8.6 million included in current liabilities related to corresponding revenue-share obligation owed to customers that generated the administrative fees.
Business Combination, Acquired Receivables, Fair Value			0	35,000,000
Business Combination, Liability Related to Acquired Receivables, Fair Value			0	8,600,000
Business Combination, Acquired Receivables, Fair Value Net of Liability			0
Indefinite-lived Intangible Assets Acquired			28,000,000
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Less Noncontrolling Interest [Abstract]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other			59,813,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total			465,500,000
Goodwill	4,541,772,000	3,868,857,000	680,732,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets			5,798,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets, Total			1,211,843,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other			24,717,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent			165,052,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other			6,524,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net, Total			1,015,550,000
Business Acquisition, Pro Forma Revenue							780,278,000	2,320,497,000
Business Acquisition, Pro Forma Net Income (Loss)							128,226,000	380,046,000
Business Acquisition, Pro Forma Earnings Per Share, Basic							$ 1.31	$ 3.90
Business Acquisition, Pro Forma Earnings Per Share, Diluted							$ 1.29	$ 3.82
Business Acquisition, Pro Forma Information, Description								Pro forma earnings for the three and nine months ended September 30, 2012 were adjusted by $41.3 million and $50.6 million, respectively, for non-recurring acquisition and other costs as well as recurring changes in amortization, interest expense and taxes related to the acquisition.
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired					$ 433,000,000	$ 5,000,000
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life					20 years	3 years