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Restructuring | 12 Months Ended
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Dec. 31, 2020
Restructuring And Related Activities [Abstract] |
Restructuring | 20. Restructuring During the years ended December 31, 2020, 2019 and 2018, the Company incurred $7.0 million, $9.8 million and $12.9 million of restructuring expense, respectively. Expenses for 2020 related primarily to costs associated with headcount reductions in Europe and North America, partially offset by $2.5 million of income primarily related to the forfeiture of equity compensation awards associated with employee separation agreements. The costs for 2019 related primarily to severance costs for headcount reductions in Europe, North America and India. The costs for 2018 related primarily to severance costs for the departure of an executive officer, costs associated with training of skilled labor as a result of the transfer of crawler production to Shady Grove, PA and costs associated with headcount reductions in Europe. Restructuring expense for the years ended December 31, 2020, 2019 and 2018 included $2.2 million, zero and $2.0 million, respectively, of expense related to executive severance. The following is a summary of the Company's restructuring activities for the years ended December 31, 2020, 2019 and 2018:
|  | 2020 |  |  | 2019 |  |  | 2018 |
Balance at beginning of period |  | $ | 2.0 |  |  | $ | 3.3 |  |  | $ | 5.6 |
Restructuring expenses* |  |  | 9.5 |  |  |  | 9.8 |  |  |  | 12.9 |
Use of reserve |  |  | (6.2 | ) |  |  | (10.9 | ) |  |  | (15.1 | )
Reserve reclassification |  |  | — |  |  |  | (0.2 | ) |  |  | — |
Currency translation |  |  | — |  |  |  | — |  |  |  | (0.1 | )
Balance at end of period |  | $ | 5.3 |  |  | $ | 2.0 |  |  | $ | 3.3 |
*Restructuring expense within the rollforward excludes income recorded related to the forfeiture of equity compensation awards associated with employee separation agreements which was recorded directly to restructuring expense in the Condensed Consolidated Statement of Operations and, therefore, did not impact the restructuring accrual.

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- Definition The entire disclosure for restructuring and related activities. Description of restructuring activities such as exit and disposal activities, include facts and circumstances leading to the plan, the expected plan completion date, the major types of costs associated with the plan activities, total expected costs, the accrual balance at the end of the period, and the periods over which the remaining accrual will be settled. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -URI http://asc.fasb.org/topic&trid=2175745 + Details
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