Goodwill and Intangible Assets - Goodwill Roll Forward (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018		Dec. 31, 2017		Dec. 31, 2016
Goodwill [Roll Forward]
Beginning balance		$ 4,175.4		$ 4,049.4
Goodwill, Reallocation	[1]			0.0
Business divestitures				(30.5)
Impairments		(136.7)
Currency translation adjustments		(58.9)		156.5
Ending balance		3,979.8		4,175.4		$ 4,049.4
CHCA
Goodwill [Line Items]
Accumulated impairment		(161.2)		(24.5)
Goodwill [Roll Forward]
Beginning balance		1,847.4	[2]	1,810.6
Goodwill, Reallocation	[1]			35.3
Business divestitures				0.0
Impairments		(136.7)
Currency translation adjustments		3.0		1.5
Ending balance		1,713.7	[2]	1,847.4	[2]	1,810.6
CHCI
Goodwill [Line Items]
Accumulated impairment		(868.4)		(864.4)
Goodwill [Roll Forward]
Beginning balance		1,205.7	[3]	1,070.8
Goodwill, Reallocation	[1]			0.0
Business divestitures				(4.1)
Impairments		0.0				(868.4)
Currency translation adjustments		(54.4)		139.0
Ending balance		1,151.3	[3]	1,205.7	[3]	1,070.8
RX
Goodwill [Roll Forward]
Beginning balance		1,122.3		1,086.6
Goodwill, Reallocation	[1]			27.7
Business divestitures				0.0
Impairments		0.0
Currency translation adjustments		(7.5)		8.0
Ending balance		1,114.8		1,122.3		1,086.6
Other
Goodwill [Roll Forward]
Beginning balance		0.0		81.4
Goodwill, Reallocation	[1]			(63.0)
Business divestitures				(26.4)
Impairments		0.0
Currency translation adjustments		0.0		8.0
Ending balance		$ 0.0		$ 0.0		$ 81.4

[1] (3) Certain cash flows associated with the API business were retained. We performed a relative fair value allocation of the business retained and allocated it among the two segments where the business was allocated.

[2] (1) We had accumulated impairments of $161.2 million and $24.5 million for the years ended December 31, 2018 and December 31, 2017, respectively.

[3] (2) We had accumulated impairments of $868.4 million for the years ended December 31, 2018 and December 31, 2017.