Basis of Financial Statement Presentation - Narrative (Details) - Interface - USD ($) $ in Millions		3 Months Ended
Aug. 31, 2018	Jun. 30, 2019
New Accounting Pronouncement, Early Adoption [Line Items]
Business acquisitions, net of cash acquired		$ 267.0
Cash acquired from acquisition	$ 5.2

Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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