Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

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Name:	us-gaap_SeveranceCosts1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Restructuring Charges, Net of Reversals and Impairment, and Related Charges (Narratives) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		13 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021
Restructuring Cost And Reserve [Line Items]
Restructuring charges, net of reversals and impairment	$ 0.4		$ 2.1
Facility related charges	0.3		0.9
Severance and benefits charges	$ 0.1		1.2
Reduction-in-force
Restructuring Cost And Reserve [Line Items]
Reduction in force or severance and benefits			$ 0.7		$ 9.3
Prior year Reduction-in-force plans
Restructuring Cost And Reserve [Line Items]
Restructuring charges, net of reversals and impairment		$ 6.6		$ 19.4
Severance and benefits charges		6.3		11.2
Charges for impairment of right-of-use assets		$ 0.3		$ 8.2