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Goodwill and Other Intangible Assets - Other Intangible Assets (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule of Intangible Assets by Major Class |  |
Gross Carrying Amount | $ 708.3 | $ 667.2
Accumulated Amortization | (305.2) | (255.9)
Net | 403.1 | 411.3
Certificates of need [Member] |  |
Schedule of Intangible Assets by Major Class |  |
Gross Carrying Amount | 113.7 | 98.6
Accumulated Amortization | (19.5) | (12.9)
Net | 94.2 | 85.7
Licenses [Member] |  |
Schedule of Intangible Assets by Major Class |  |
Gross Carrying Amount | 146.0 | 142.0
Accumulated Amortization | (71.6) | (62.1)
Net | 74.4 | 79.9
Noncompete agreements [Member] |  |
Schedule of Intangible Assets by Major Class |  |
Gross Carrying Amount | 63.5 | 62.2
Accumulated Amortization | (55.4) | (47.3)
Net | 8.1 | 14.9
Trade Name - Encompass [Member] |  |
Schedule of Intangible Assets by Major Class |  |
Gross Carrying Amount | 135.2 | 135.2
Accumulated Amortization | 0.0 | 0.0
Net | 135.2 | 135.2
Trade names [Member] |  |
Schedule of Intangible Assets by Major Class |  |
Gross Carrying Amount | 35.1 | 34.6
Accumulated Amortization | (16.4) | (13.9)
Net | 18.7 | 20.7
Internal-use Software [Member] |  |
Schedule of Intangible Assets by Major Class |  |
Gross Carrying Amount | 201.6 | 181.4
Accumulated Amortization | (132.3) | (110.2)
Net | 69.3 | 71.2
Market access assets [Member] |  |
Schedule of Intangible Assets by Major Class |  |
Gross Carrying Amount | 13.2 | 13.2
Accumulated Amortization | (10.0) | (9.5)
Net | $ 3.2 | $ 3.7

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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