Reflects the estimated amount of loss from the specified contingency as of the balance sheet date.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14435-108349

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 9
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14557-108349

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=115931803&loc=d3e12021-110248

Name:	us-gaap_LossContingencyEstimateOfPossibleLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Commitments and Contingencies - Legal Proceedings (Details) - Amendment of pension for foreign subsidiary - Judicial ruling £ in Millions, $ in Millions	Jun. 30, 2018 USD ($)	Jun. 30, 2018 GBP (£)	Jul. 02, 2016 GBP (£)	Jun. 30, 2016 USD ($)	Jun. 30, 2016 GBP (£)
Loss Contingencies [Line Items]
Amount accrued	$ 7.8	£ 5.9	£ 5.7
Minimum
Loss Contingencies [Line Items]
Estimate liability				$ 7.4	£ 5.7
Maximum
Loss Contingencies [Line Items]
Estimate liability				$ 10.9	£ 8.4