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Debt and Lines of Credit - Long-term Debt (Details) - Unsecured Term Loan - 2.150% Senior Unsecured Notes Due December 2030 - Acuity Brands Lighting, Inc. $ in Millions	Nov. 10, 2020 USD ($)
Debt Instrument [Line Items]
Debt instrument, face amount	$ 500.0
Interest rate (percent)	2.15%
Debt instrument issuance price percent of total	99.737%
Debt issuance costs, gross	$ 4.8
Term of facility	10 years

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