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Acquisitions (Narrative) (Details) $ in Millions |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jun. 01, 2020 USD ($) | Aug. 02, 2019 USD ($) item | Jul. 01, 2019 USD ($) | Dec. 31, 2021 | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Reacquired Franchise Rights [Member] |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Average remaining life |  |  |  | 7 years 4 months 24 days |  |
Non-Compete Agreements [Member] |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Average remaining life |  |  |  | 6 years 6 months |  |
Roto-Rooter, Bloomington [Member] |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Acquisition date |  |  |  | Jun. 01, 2020 |  |
Acquisition, in cash | $ 2.2 |  |  |  |  |
Roto-Rooter, Oakland [Member] |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Acquisition date |  |  |  | Jul. 01, 2019 |  |
Acquisition, in cash |  |  | $ 18.0 |  |  |
HSW And Oakland [Member] |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Acquisition expense |  |  |  |  |  | $ 3.4
HSW And Oakland [Member] | Customer Relationships [Member] |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Average remaining life |  |  |  | 20 years 4 months 24 days |  |
HSW And Oakland [Member] | Non-Compete Agreements [Member] |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Average remaining life |  |  |  | 4 years |  |
Roto-Rooter [Member] | HSW RR, Inc [Member] |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Acquisition, in cash |  | $ 120.0 |  |  |  |
Additional business combination cost |  | $ 1.4 |  |  | $ 1.4 |
Number of owned and operated franchises | item |  | 14 |  |  |  |
Revolving Credit Facility [Member] |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |
Borrowing amount |  | $ 450.0 |  |  |  |

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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