Leases - Narrative (Details) $ in Millions	3 Months Ended
	Mar. 31, 2019 USD ($)
Lessee, Lease, Description [Line Items]
Operating lease expense	$ 7.1
Operating lease liabilities in exchange for leased assets	1.4
Current operating lease liabilities
Lessee, Lease, Description [Line Items]
Operating lease expense	4.6
Noncurrent operating lease liabilities
Lessee, Lease, Description [Line Items]
Operating lease expense	$ 2.5
Minimum
Lessee, Lease, Description [Line Items]
Lease, remaining lease term	1 year
Maximum
Lessee, Lease, Description [Line Items]
Lease, remaining lease term	9 years