Fair Value Measurements (Derivatives on the Balance Sheet) (Details) - USD ($) $ in Millions	Apr. 30, 2020	Jul. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Notional amounts	$ 81.1	$ 84.0
Forward foreign currency exchange contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Notional amounts	25.3	28.2
Net investment hedges
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Notional amounts	55.8	55.8
Fair Value, Inputs, Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Derivative assets	9.6	2.7
Derivative liabilities	1.6	3.7
Fair Value, Inputs, Level 2 \| Prepaid expenses and other current assets
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Derivative assets	5.0	2.7
Fair Value, Inputs, Level 2 \| Other long-term assets
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Derivative assets	4.6
Fair Value, Inputs, Level 2 \| Forward foreign currency exchange contracts
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Derivative assets	3.9	1.6
Derivative liabilities	1.6	1.8
Fair Value, Inputs, Level 2 \| Net investment hedges
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Derivative assets	5.7	1.1
Derivative liabilities	$ 0.0	$ 1.9

Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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