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Related Parties (Details) - USD ($) $ in Millions		12 Months Ended
Related Parties (Details) - USD ($) $ in Millions	Feb. 26, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Related parties
Purchase price of land and buildings acquired		$ 73.0	$ 49.2	$ 43.7
Subsequent Event
Related parties
Purchase price of land and buildings acquired	$ 12.3
Subsequent Event \| Land and buildings at 15 Fortune Drive
Related parties
Purchase price of land and buildings acquired	5.6
Subsequent Event \| Land and buildings at 44 Manning Road
Related parties
Purchase price of land and buildings acquired	$ 6.7
Certain shareholders
Related parties
Expenses incurred		1.2	1.2	3.5
Life sciences company
Related parties
Revenue		$ 2.8	$ 2.9	$ 2.6