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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill | The changes in the carrying amount of goodwill in 2017 and 2016, in total and by segment, are summarized in the table below (in millions):
Segment: | Balance at December 31, 2015 (1) |  | Change in foreign currency translation rate |  | Balance at December 31, 2016 |  | Change in foreign currency translation rate |  | Balance at December 31, 2017
Residential Heating & Cooling | $ | 26.1 |  |  | $ | — |  |  | $ | 26.1 |  |  | $ | — |  |  | $ | 26.1 |
Commercial Heating & Cooling | 60.6 |  |  | (0.5 | ) |  | 60.1 |  |  | 2.1 |  |  | 62.2 |
Refrigeration | 108.4 |  |  | 0.5 |  |  | 108.9 |  |  | 3.3 |  |  | 112.2 |
| $ | 195.1 |  |  | $ | — |  |  | $ | 195.1 |  |  | $ | 5.4 |  |  | $ | 200.5 |
(1) The goodwill balances in the table above are presented net of accumulated impairment charges of $21.2 million, all of which relate to impairments in periods prior to 2016.
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,
| 2017 |  | 2016
| Gross Amount |  | Accumulated Amortization |  | Net Amount |  | Gross Amount |  | Accumulated Amortization |  | Net Amount
Customer relationships | 15.8 |  |  | (15.1 | ) |  | 0.7 |  |  | 15.9 |  |  | (14.9 | ) |  | 1.0 |
Patents and others | 14.3 |  |  | (6.4 | ) |  | 7.9 |  |  | 12.7 |  |  | (6.4 | ) |  | 6.3 |
Total | $ | 30.1 |  |  | $ | (21.5 | ) |  | $ | 8.6 |  |  | $ | 28.6 |  |  | $ | (21.3 | ) |  | $ | 7.3 |
Amortization expense | Amortization expense related to these intangible and other assets was as follows (in millions):
| For the Years Ended December 31,
| 2017 |  | 2016 |  | 2015
Amortization expense (1) | $ | 0.5 |  |  | $ | 0.4 |  |  | $ | 2.7 |
(1) Included in the amortization expense in 2015 are amounts relating to customer relationships that were written off during the fourth quarter of 2015.
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: |
2018 | $ | 0.5 |
2019 | 0.5 |
2020 | 0.4 |
2021 | 0.2 |
2022 | 0.2 |
Thereafter | 6.8 |

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