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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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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.

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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.

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