Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

Schedule of commitments under operating leases

The estimated future minimum noncancelable lease commitments under existing operating leases, as of December 31, 2018, are as follows:

	Facilities		Equipment		Total
2019	$	4.2	$	6.2	$	10.4
2020	3.6		0.2		3.8
2021	3.3		0.1		3.4
2022	2.2		—		2.2
2023	1.5		—		1.5
Thereafter	4.1		—		4.1
	$	18.9	$	6.5	$	25.4

Schedule of rent expense under operating leases

Rent expense under operating leases was:

Year Ended December 31,	Facilities		Equipment		Total
2018	$	3.7	$	1.2	$	4.9
2017	$	3.1	$	1.2	$	4.3
2016	$	15.9	$	0.9	$	16.8

Schedule of commitments under facility lease obligation

As of December 31, 2018, the estimated future minimum noncancelable commitments under the Company's capital and facility lease obligations, excluding the purchase price the Company would be obligated to pay if the Company were to exercise its option to purchase the Facility (as described above), are as follows:

	Capital and Facility Lease Obligations
2019	$	26.4
2020	28.4
2021	27.9
2022	7.0
2023	—
Thereafter	—
	$	89.7