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Goodwill and Other Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2017
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, 2017, 2016, and 2015 (in millions):
 
Inpatient Rehabilitation
 
Home Health and Hospice
 
Consolidated
Goodwill as of December 31, 2014
$
491.5

 
$
592.5

 
$
1,084.0

Acquisitions
641.6

 
164.5

 
806.1

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
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:
 
 
 
 
 
2017
$
113.7

 
$
(19.5
)
 
$
94.2

2016
98.6

 
(12.9
)
 
85.7

Licenses:
 

 
 

 
 

2017
$
146.0

 
$
(71.6
)
 
$
74.4

2016
142.0

 
(62.1
)
 
79.9

Noncompete agreements:
 

 
 

 
 

2017
$
63.5

 
$
(55.4
)
 
$
8.1

2016
62.2

 
(47.3
)
 
14.9

Trade name - Encompass:
 
 
 
 
 
2017
$
135.2

 
$
—

 
$
135.2

2016
135.2

 
—

 
135.2

Trade names - all other:
 

 
 

 
 

2017
$
35.1

 
$
(16.4
)
 
$
18.7

2016
34.6

 
(13.9
)
 
20.7

Internal-use software:
 

 
 

 
 

2017
$
201.6

 
$
(132.3
)
 
$
69.3

2016
181.4

 
(110.2
)
 
71.2

Market access assets:
 
 
 
 
 
2017
$
13.2

 
$
(10.0
)
 
$
3.2

2016
13.2

 
(9.5
)
 
3.7

Total intangible assets:
 

 
 

 
 

2017
$
708.3

 
$
(305.2
)
 
$
403.1

2016
667.2

 
(255.9
)
 
411.3
Schedule of Amortization Expense, Intangible Assets
Amortization expense for other intangible assets is as follows (in millions):
 
For the Year Ended December 31,
 
2017
 
2016
 
2015
Amortization expense
$
49.3

 
$
48.5

 
$
36.0
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
2018
$
42.4

2019
37.2

2020
30.6

2021
26.1

2022
22.7