Leases - Narrative (Details) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2019 USD ($)
Operating Leased Assets [Line Items]
Option to extend lease term	7 years	7 years
Option to terminate lease term		1 year
Operating lease expense	$ 19.7	$ 57.3
Operating leases, not yet commenced, amount	$ 21.2	$ 21.2
Minimum
Operating Leased Assets [Line Items]
Remaining lease terms		1 year
Operating leases, not yet commenced, term	1 year	1 year
Maximum
Operating Leased Assets [Line Items]
Remaining lease terms		10 years
Operating leases, not yet commenced, term	8 years	8 years