Business Combinations (Tables)

9 Months Ended

Sep. 30, 2018

Business Combinations [Abstract]

Revenues and Operating Income

The following table summarizes the revenue and operating income of these acquisitions for the periods presented subsequent to their date of acquisition.

	Three Month Periods Ended September 30,				Nine Month Periods Ended September 30,
	2018		2017		2018		2017
Revenue	$	25.3	$	5.9	$	63.1	$	7.9
Operating income		2.0		0.5		3.2		0.6