Leases - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019
Lessee, Lease, Description [Line Items]
Operating lease expense	$ 7.4	$ 21.8
Operating lease liabilities in exchange for leased assets	3.8	6.7
Current operating lease liabilities
Lessee, Lease, Description [Line Items]
Operating lease expense	4.9	14.3
Noncurrent operating lease liabilities
Lessee, Lease, Description [Line Items]
Operating lease expense	$ 2.5	$ 7.5
Minimum
Lessee, Lease, Description [Line Items]
Lease, remaining lease term		1 year
Maximum
Lessee, Lease, Description [Line Items]
Lease, remaining lease term		10 years