Commitments and Contingencies - Multiemployer Pension and Defined Contribution Plans Narrative (Details) - Building Service 32BJ - USD ($) $ in Millions	12 Months Ended
Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Pension Plans
Multiemployer Plans [Line Items]
Plan contributions	$ 272.3	$ 257.8	$ 249.5
Health Plans
Multiemployer Plans [Line Items]
Plan contributions	$ 1,400.0	$ 1,300.0	$ 1,200.0

Amount of contributions made to multiemployer plan by all employers who participate in plan.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 80
-Section 50
-Paragraph 7
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450678-114947

Name:	us-gaap_MultiemployerPlansPlanContributions1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration