Goodwill And Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Summary Of The Change In The Carrying Amount Of Goodwill By Reportable Segment

A summary of the change in the carrying amount of goodwill for our segments (see Note 19, “Segment Information”) for 2017 and 2016 is as follows:

	Commercial and Specialty Business			Government Business		Other		Total
Balance as of January 1, 2016	$	11,818.9		$	5,743.3	$	—	$	17,562.2
Other adjustments	(1.0		)	—		—		(1.0		)
Balance as of December 31, 2016	11,817.9			5,743.3		—		17,561.2
Acquisitions	—			1,658.5		11.5		1,670.0
Balance as of December 31, 2017	$	11,817.9		$	7,401.8	$	11.5	$	19,231.2
Accumulated impairment as of December 31, 2017	$	(41.0	)	$	—	$	—	$	(41.0	)

Components Of Other Intangible Assets

The components of other intangible assets as of December 31, 2017 and 2016 are as follows:

	2017							2016
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Intangible assets with finite lives:
Customer relationships	$	3,724.9	$	(2,877.8	)	$	847.1	$	3,310.9	$	(2,759.7	)	$	551.2
Provider and hospital relationships	187.4		(73.2		)	114.2		150.5		(65.9		)	84.6
Other	184.0		(67.2		)	116.8		89.4		(50.6		)	38.8
Total	4,096.3		(3,018.2		)	1,078.1		3,550.8		(2,876.2		)	674.6
Intangible assets with indefinite lives:
Blue Cross and Blue Shield and other trademarks	6,298.7		—			6,298.7		6,298.7		—			6,298.7
State Medicaid licenses	991.6		—			991.6		991.6		—			991.6
Total	7,290.3		—			7,290.3		7,290.3		—			7,290.3
Other intangible assets	$	11,386.6	$	(3,018.2	)	$	8,368.4	$	10,841.1	$	(2,876.2	)	$	7,964.9