Goodwill (Tables)

12 Months Ended

Dec. 31, 2019

Goodwill.

Schedule of changes in the carrying amount of goodwill

	(in millions)
Balance at January 1, 2017	$	1,827.4
Acquisitions		10.3
Effect of foreign currency translation		4.9
Balance at December 31, 2017		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