Goodwill and Other Intangible Assets - Goodwill (Details) $ in Millions	6 Months Ended
Jun. 30, 2018 USD ($)
Goodwill [Roll Forward]
December 31, 2017	$ 4,175.4
Currency translation adjustments	(37.9)
June 30, 2018	4,137.5
CHCA
Goodwill [Roll Forward]
December 31, 2017	1,847.4
Currency translation adjustments	(2.0)
June 30, 2018	1,845.4
CHCI
Goodwill [Roll Forward]
December 31, 2017	1,205.7
Currency translation adjustments	(30.6)
June 30, 2018	1,175.1
RX
Goodwill [Roll Forward]
December 31, 2017	1,122.3
Currency translation adjustments	(5.3)
June 30, 2018	$ 1,117.0

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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- Definition

Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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