Debt and Credit Arrangements - Foreign Facilities (Details) - Foreign facilities - Revolving Credit Facility - USD ($)	Mar. 31, 2021	Dec. 31, 2020
Debt Instrument
Maximum borrowing capacity	$ 80,900,000
Weighted average interest rate (percent)		1.30%
Letters of credit outstanding	$ 51,600,000	$ 47,700,000

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant