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Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Changes in the Carrying Amount of Goodwill | The following table shows changes in the carrying amount of Goodwill for the years ended December 31, 2018, 2017, and 2016 (in millions):
| Inpatient Rehabilitation |  | Home Health and Hospice |  | Consolidated
Goodwill as of December 31, 2015 | $ | 1,133.1 |  |  | $ | 757.0 |  |  | $ | 1,890.1 |
Acquisitions | 8.9 |  |  | 42.5 |  |  | 51.4 |
Divestiture of pediatric home health services | — |  |  | (14.3 | ) |  | (14.3 | )
Goodwill as of December 31, 2016 | 1,142.0 |  |  | 785.2 |  |  | 1,927.2 |
Acquisitions | 24.0 |  |  | 21.4 |  |  | 45.4 |
Goodwill as of December 31, 2017 | 1,166.0 |  |  | 806.6 |  |  | 1,972.6 |
Acquisitions | 23.2 |  |  | 105.0 |  |  | 128.2 |
Goodwill as of December 31, 2018 | $ | 1,189.2 |  |  | $ | 911.6 |  |  | $ | 2,100.8 |
Schedule of Intangible Assets by Major Class | The range of estimated useful lives and the amortization basis for our intangible assets, excluding goodwill, are generally as follows:
| Estimated Useful Life and Amortization Basis
Certificates of need | 10 to 30 years using straight-line basis
Licenses | 10 to 20 years using straight-line basis
Noncompete agreements | 1 to 18 years using straight-line basis
Trade names: |
Encompass | indefinite-lived asset
All other | 1 to 20 years using straight-line basis
Internal-use software | 3 to 7 years using straight-line basis
Market access assets | 20 years using accelerated basis
The following table provides information regarding our other intangible assets (in millions):
| Gross Carrying Amount |  | Accumulated Amortization |  | Net
Certificates of need: |  |  |  |  |
2018 | $ | 148.3 |  |  | $ | (28.2 | ) |  | $ | 120.1 |
2017 | 113.7 |  |  | (19.5 | ) |  | 94.2 |
Licenses: |  |  |  |  |  |  |  |
2018 | $ | 169.1 |  |  | $ | (82.2 | ) |  | $ | 86.9 |
2017 | 146.0 |  |  | (71.6 | ) |  | 74.4 |
Noncompete agreements: |  |  |  |  |  |  |  |
2018 | $ | 65.6 |  |  | $ | (58.6 | ) |  | $ | 7.0 |
2017 | 63.5 |  |  | (55.4 | ) |  | 8.1 |
Trade name - Encompass: |  |  |  |  |
2018 | $ | 135.2 |  |  | $ | — |  |  | $ | 135.2 |
2017 | 135.2 |  |  | — |  |  | 135.2 |
Trade names - all other: |  |  |  |  |  |  |  |
2018 | $ | 38.9 |  |  | $ | (19.4 | ) |  | $ | 19.5 |
2017 | 35.1 |  |  | (16.4 | ) |  | 18.7 |
Internal-use software: |  |  |  |  |  |  |  |
2018 | $ | 161.3 |  |  | $ | (89.3 | ) |  | $ | 72.0 |
2017 | 201.6 |  |  | (132.3 | ) |  | 69.3 |
Market access assets: |  |  |  |  |
2018 | $ | 13.2 |  |  | $ | (10.5 | ) |  | $ | 2.7 |
2017 | 13.2 |  |  | (10.0 | ) |  | 3.2 |
Total intangible assets: |  |  |  |  |  |  |  |
2018 | $ | 731.6 |  |  | $ | (288.2 | ) |  | $ | 443.4 |
2017 | 708.3 |  |  | (305.2 | ) |  | 403.1 |
Schedule of Amortization Expense, Intangible Assets | Amortization expense for other intangible assets is as follows (in millions):
| For the Year Ended December 31,
| 2018 |  | 2017 |  | 2016
Amortization expense | $ | 51.4 |  |  | $ | 49.3 |  |  | $ | 48.5 |
Schedule of Future Estimated Amortization Expense, Intangible Assets | Total estimated amortization expense for our other intangible assets for the next five years is as follows (in millions):
Year Ending December 31, | Estimated Amortization Expense
2019 | $ | 56.9 |
2020 | 43.3 |
2021 | 35.7 |
2022 | 29.6 |
2023 | 27.0 |

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