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Summary of Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2020
Accounting Policies [Abstract] |
Schedule for Company's allowance for doubtful accounts | Changes in the Company's allowance for credit losses by segment follows:
(in millions) |  | CCM |  | CIT |  | CFT |  | Corporate |  | Total
Balance as of December 31, 2018 |  | $ | 2.4 |  |  | $ | 1.0 |  |  | $ | 0.5 |  |  | $ | — |  |  | $ | 3.9 |
Current period provision |  | — |  |  | 0.8 |  |  | 0.1 |  |  | 0.5 |  |  | 1.4 |
Amounts acquired |  | 0.1 |  |  | — |  |  | 0.5 |  |  | — |  |  | 0.6 |
Amounts written off |  | (0.3) |  |  | (0.2) |  |  | — |  |  | — |  |  | (0.5) |
Balance as of December 31, 2019 |  | $ | 2.2 |  |  | $ | 1.6 |  |  | $ | 1.1 |  |  | $ | 0.5 |  |  | $ | 5.4 |
Current period provision |  | 0.8 |  |  | 0.1 |  |  | 0.1 |  |  | — |  |  | 1.0 |
Amounts written off |  | (0.6) |  |  | (0.4) |  |  | (0.4) |  |  | — |  |  | (1.4) |
Balance as of December 31, 2020 |  | $ | 2.4 |  |  | $ | 1.3 |  |  | $ | 0.8 |  |  | $ | 0.5 |  |  | $ | 5.0 |

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- Definition Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3,4) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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