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Segment Information - Narrative (Details) record in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2019 segment sites customer	Dec. 31, 2018 record	Oct. 16, 2017
Segment Reporting Information [Line Items]
Number of business records (more than) | record		300
Ceridian
Segment Reporting Information [Line Items]
Ownership interest, equity method investment (as a percent)	23.30%
ABRH
Segment Reporting Information [Line Items]
Ownership interest, controlling interest (as percent)	65.40%
99 Restaurants
Segment Reporting Information [Line Items]
Ownership interest, controlling interest (as percent)	88.50%
T-System
Segment Reporting Information [Line Items]
Ownership interest, controlling interest (as percent)			97.00%
Number of businesses | segment	2
T-System | T-System Coding Software & Outsourced Solutions
Segment Reporting Information [Line Items]
Number of customers (more than) | customer	75
Number of sites | sites	400
T-System | Software Solutions | T-System Clinical Documentation
Segment Reporting Information [Line Items]
Number of customers (more than) | customer	240
Number of sites | sites	450
T-System | T-Sheet | T-System Clinical Documentation
Segment Reporting Information [Line Items]
Number of customers (more than) | customer	200
Number of sites | sites	475

X

- Definition

Number Of Business Records

+ References

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- Definition

Number Of Customers

+ References

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- Definition

Number Of Sites

+ References

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571

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- Definition

The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

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- Definition

Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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