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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill | The changes in the carrying amount of goodwill in 2016 and 2015, in total and by segment, are summarized in the table below (in millions):
Segment: | Balance at December 31, 2014 (2) |  | Impairment |  | Other(1) |  | Balance at December 31, 2015 |  | Impairment |  | Other(1) |  | Balance at December 31, 2016
Residential Heating & Cooling | $ | 26.1 |  |  | $ | — |  |  | $ | — |  |  | $ | 26.1 |  |  | $ | — |  |  | $ | — |  |  | $ | 26.1 |
Commercial Heating & Cooling | 62.3 |  |  | — |  |  | (1.7 | ) |  | 60.6 |  |  | — |  |  | (0.5 | ) |  | 60.1 |
Refrigeration | 121.0 |  |  | (5.5 | ) |  | (7.1 | ) |  | 108.4 |  |  | — |  |  | 0.5 |  |  | 108.9 |
| $ | 209.4 |  |  | $ | (5.5 | ) |  | $ | (8.8 | ) |  | $ | 195.1 |  |  | $ | — |  |  | $ | — |  |  | $ | 195.1 |
(1) Other consists of changes in foreign currency translation rates. (2) The goodwill balances in the table above are presented net of accumulated impairment charges of $15.7 million, all of which relate to impairments in periods prior to 2014.
Summary of amortization of intangible assets | Identifiable intangible and other assets subject to amortization were recorded in Other assets, net in the accompanying Consolidated Balance Sheets and were comprised of the following (in millions):
| As of December 31,
| 2016 |  | 2015
| Gross Amount |  | Accumulated Amortization |  | Net Amount |  | Gross Amount |  | Accumulated Amortization |  | Net Amount
Customer relationships (1) | 15.9 |  |  | (14.9 | ) |  | 1.0 |  |  | 15.9 |  |  | (14.6 | ) |  | 1.3 |
Patents and others | 12.7 |  |  | (6.4 | ) |  | 6.3 |  |  | 11.2 |  |  | (6.3 | ) |  | 4.9 |
Total | $ | 28.6 |  |  | $ | (21.3 | ) |  | $ | 7.3 |  |  | $ | 27.1 |  |  | $ | (20.9 | ) |  | $ | 6.2 |
(1) The impairment related to customer relationships has been removed from the gross amount as well as the accumulated amortization, but is included in amortization expense for the previous year.
Amortization expense | Amortization expense related to these intangible and other assets was as follows (in millions):
| For the Years Ended December 31,
| 2016 |  | 2015 |  | 2014
Amortization expense (1) | $ | 0.4 |  |  | $ | 2.7 |  |  | $ | 2.9 |
(1) The impairment related to customer relationships has been removed from the gross amount as well as the accumulated amortization, but is included in amortization expense for the previous year.
Summary of estimated intangible amortization expense for the next five years | Estimated amortization expense for the next five years and thereafter is as follows (in millions):
Estimated Future Amortization Expense: |
2017 | $ | 0.4 |
2018 | 0.4 |
2019 | 0.4 |
2020 | 0.4 |
2021 | 0.2 |
Thereafter | 5.5 |

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