The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3213-108585

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

Related Parties (Details) - USD ($) $ in Millions		12 Months Ended
Related Parties (Details) - USD ($) $ in Millions	Feb. 26, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Related parties
Purchase price of land and buildings acquired	$ 12.3	$ 97.2	$ 73.0	$ 49.2
Land and buildings at 15 Fortune Drive
Related parties
Purchase price of land and buildings acquired	5.6
Land and buildings at 44 Manning Road
Related parties
Purchase price of land and buildings acquired	$ 6.7