Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2018

Commitments And Contingencies Disclosure [Abstract]

Summary of Future Minimum Payments

Future minimum payments, by year, and in the aggregate, under these leases with initial terms of one year or more consisted of the following at December 31, 2018 (in millions):

	Non-cancelable		Minimum
	Operating		Sublease
	Leases		Income			Net
2019	$	11.5	$	(0.4	)	$	11.1
2020		8.8		(0.1	)		8.7
2021		7.0		(0.1	)		6.9
2022		4.8		—			4.8
2023		3.9		—			3.9
Thereafter		8.0		—			8.0
Total minimum lease payments	$	44.0	$	(0.6	)	$	43.4