Fair value measurements (Tables)

6 Months Ended

Jan. 31, 2017

Fair Value Disclosures [Abstract]

Assets and Liabilities Carried at Fair Value and Measured on Recurring Basis

The following tables provide the assets and liabilities carried at fair value and measured on a recurring basis at January 31, 2017 and July 31, 2016:

	Fair Value Measurements at January 31, 2017
(in millions)	Total		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets
Cash and cash equivalents	$	153.0	$	153.0	$	—	$	—
Plan assets for deferred compensation		6.5		6.5		—		—
Total assets at fair value	$	159.5	$	159.5	$	—	$	—
Liabilities
Contingent consideration	$	4.1	$	—	$	—	$	4.1
Foreign currency forward contracts		—		—		—		—
Total liabilities at fair value	$	4.1	$	—	$	—	$	4.1

	Fair Value Measurements at July 31, 2016
(in millions)	Total		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets
Cash and cash equivalents	$	118.7	$	118.7	$	—	$	—
Plan assets for deferred compensation		5.9		5.9		—		—
Total assets at fair value	$	124.6	$	124.6	$	—	$	—
Liabilities
Contingent consideration	$	12.2	$	—	$	—	$	12.2
Foreign currency forward contracts		0.3		—		0.3		—
Total liabilities at fair value	$	12.5	$	—	$	0.3	$	12.2