Nominal or face amount used to calculate payment on derivative.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959

Name:	us-gaap_DerivativeNotionalAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

Derivative financial instruments - Interest Rate Caps (Details) - Mar. 28, 2020	USD ($)	EUR (€)
June 30, 2017 to June 30, 2020
Derivative
Notional amount of derivative contracts	$ 200,000,000.0
June 28, 2019 to June 30, 2020
Derivative
Notional amount of derivative contracts	$ 1,000,000,000.0
July 1, 2019 to June 30, 2023
Derivative
Notional amount of derivative contracts \| €		€ 425,000,000.0