Leases - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating Leased Assets [Line Items]
Option to extend lease term	7 years
Option to terminate lease term	1 year
Operating lease expense	$ 77.7
Rental expense		$ 89.4	$ 87.5
Operating leases, not yet commenced, amount	$ 45.5
Minimum
Operating Leased Assets [Line Items]
Remaining lease term	1 year
Operating lease, not yet commenced, amount	1 year
Maximum
Operating Leased Assets [Line Items]
Remaining lease term	10 years
Operating lease, not yet commenced, amount	8 years