Employee Benefit Plans - Summary of Net Periodic Pension Cost (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]
Service cost	$ 9.4	$ 9.6	$ 10.0
Interest cost	5.0	4.7	4.3
Expected return on plan assets	(6.0)	(6.1)	(5.5)
Curtailment gain	0.0	(0.3)	0.0
Actuarial and other loss	15.6	6.1	1.9
Total net periodic pension cost	$ 24.0	$ 14.0	$ 10.7
Discount rate used for net periodic pension costs	1.74%	1.66%	1.60%
Discount rate used for pension benefit obligations	1.43%	1.74%	1.66%
Expected return on plan assets	3.23%	3.18%	3.22%
Rate of compensation increase	3.07%	3.22%	3.22%