Computer Software (Details) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Computer Software
Computer software	$ 953,100,000	$ 847,600,000
Accumulated amortization	(699,200,000)	(701,000,000)
Computer software, net of accumulated amortization	893,400,000us-gaap_CapitalizedComputerSoftwareNet	856,500,000us-gaap_CapitalizedComputerSoftwareNet
Amortization expense for computer software	215,000,000us-gaap_AmortizationOfIntangibleAssets	233,100,000us-gaap_AmortizationOfIntangibleAssets	246,400,000us-gaap_AmortizationOfIntangibleAssets
Software [Member]
Computer Software
Software from business acquisitions	519,200,000	535,600,000
Computer software	1,592,600,000	1,557,500,000
Purchased software	120,300,000	174,300,000
Amortization expense for computer software	209,700,000	195,800,000	195,500,000
Discontinued Operations [Member] \| Software [Member]
Computer Software
Amortization expense for computer software	$ 0	$ 0	$ 3,100,000

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

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For each balance sheet presented, the amount of accumulated amortization for capitalized computer software costs.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 985

-SubTopic 20

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Amount before accumulated amortization of capitalized costs for computer software, including but not limited to, acquired and internally developed computer software.

+ References

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The carrying amount of capitalized computer software costs net of accumulated amortization as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 985

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Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, resulting from a business combination.

+ References

No definition available.

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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