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Summary of Accounting Policies - Allowance for Doubtful Accounts (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Activity in allowance for doubtful accounts |  |
Balance at the Beginning of the period | $ 5.3 | $ 5.0
Current period provision | 2.0 | 1.2
Amounts acquired |  | 0.3
Amounts written off | (1.0) | (1.2)
Balance at the end of the period | 6.3 | 5.3
Operating Segments | CCM |  |
Activity in allowance for doubtful accounts |  |
Balance at the Beginning of the period | 2.1 | 1.8
Current period provision | 0.7 | 0.9
Amounts acquired |  | 0.0
Amounts written off | (0.4) | (0.6)
Balance at the end of the period | 2.4 | 2.1
Operating Segments | CWT |  |
Activity in allowance for doubtful accounts |  |
Balance at the Beginning of the period | 1.0 | 0.6
Current period provision | 1.7 | 0.2
Amounts acquired |  | 0.3
Amounts written off | (0.1) | (0.1)
Balance at the end of the period | 2.6 | 1.0
Operating Segments | CIT |  |
Activity in allowance for doubtful accounts |  |
Balance at the Beginning of the period | 1.2 | 1.3
Current period provision | 0.1 | (0.1)
Amounts acquired |  | 0.0
Amounts written off | (0.3) | 0.0
Balance at the end of the period | 1.0 | 1.2
Operating Segments | CFT |  |
Activity in allowance for doubtful accounts |  |
Balance at the Beginning of the period | 1.0 | 0.8
Current period provision | (0.5) | 0.2
Amounts acquired |  | 0.0
Amounts written off | (0.2) | 0.0
Balance at the end of the period | 0.3 | 1.0
Corporate |  |
Activity in allowance for doubtful accounts |  |
Balance at the Beginning of the period | 0.0 | 0.5
Current period provision | 0.0 | 0.0
Amounts acquired |  | 0.0
Amounts written off | 0.0 | (0.5)
Balance at the end of the period | $ 0.0 | $ 0.0

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- Definition Total of the deductions in a given period to allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs, representing receivables written off as uncollectible , net of recoveries. + References No definition available. + Details
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- Definition Amount of valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09(Column B)) -URI https://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09(Column E)) -URI https://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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