Business Combinations (Tables)

6 Months Ended

Jun. 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 June 30,				Six Month Periods Ended June 30,
	2018		2017		2018		2017
Revenue	$	22.6	$	2.0	$	37.8	$	2.0
Operating income		0.7		0.1		1.1		0.1