Goodwill (Tables)

12 Months Ended

Dec. 31, 2020

Goodwill.

Schedule of changes in the carrying amount of goodwill

	(in millions)
Balance at January 1, 2018	$	1,842.6
Acquisitions		33.8
Effect of foreign currency translation		(5.6)
Balance at December 31, 2018		1,870.8
Acquisitions		131.8
Purchase price allocation adjustments		(1.9)
Effect of foreign currency translation		3.1
Balance at December 31, 2019		2,003.8
Acquisition		6.9
Purchase price allocation adjustments		(77.2)
Effect of foreign currency translation		1.7
Balance at December 31, 2020	$	1,935.2