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Acquisitions - Narrative (Details) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2020 USD ($) Displays | Sep. 30, 2019 USD ($) Displays | Mar. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) Displays | Sep. 30, 2018 USD ($) | Dec. 31, 2020 USD ($) Displays
Business Acquisition [Line Items] |  |  |  |  |  |
Noncash or part noncash acquisition, value of assets acquired |  |  |  | $ 41.7 | $ 5.6 |
Acquired businesses |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Noncash or part noncash acquisition, value of assets acquired |  |  |  | $ 35.4 |  |
Acquired businesses | Subsequent Event |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Noncash or part noncash acquisition, value of assets acquired |  |  |  |  |  | $ 9.2
Acquired businesses | Digital displays |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of displays | Displays |  | 14 |  | 14 |  |
Acquired businesses | Digital displays | Subsequent Event |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of displays | Displays |  |  |  |  |  | 4
Acquired businesses | Static displays |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of displays | Displays |  | 7 |  | 7 |  |
Acquired businesses other |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Deposit for pending acquisition |  | $ 14.0 | $ 5.0 |  |  |
Acquired businesses other | Subsequent Event |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Noncash or part noncash acquisition, value of assets acquired | $ 24.0 |  |  |  |  |
Acquired businesses other | Digital displays | Subsequent Event |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of displays | Displays | 8 |  |  |  |  |

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- Definition The value of an asset or business acquired in a noncash (or part noncash) acquisition. Noncash is defined as information about all investing and financing activities of an enterprise during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4313-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4332-108586 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=98513485&loc=d3e4304-108586 + Details
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- Definition Cash outflow related to amounts given in advance to show or confirm an intention to complete an acquisition of land, buildings, other structures, or any item classified as real estate. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585 + Details
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