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Acquisitions (Narrative) (Details) - USD ($) $ in Millions				3 Months Ended	9 Months Ended
Acquisitions (Narrative) (Details) - USD ($) $ in Millions	Jun. 01, 2020	Aug. 02, 2019	Jul. 01, 2019	Sep. 30, 2019	Sep. 30, 2020
Reacquired Franchise Rights [Member]
Goodwill [Line Items]
Average amortization period				7 years 4 months 24 days
Customer Relationships [Member]
Goodwill [Line Items]
Average amortization period					20 years 4 months 24 days
Non-Compete Agreements [Member]
Goodwill [Line Items]
Average amortization period				4 years
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
Roto-Rooter [Member] \| HSW RR, Inc [Member]
Goodwill [Line Items]
Acquisition, in cash		$ 120.0
Additional business combination cost		1.4
Revolving Credit Facility [Member]
Goodwill [Line Items]
Borrowing amount		$ 450.0