Leases - Components of Lease Cost and Supplemental Information (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($)
Leases [Abstract]
Operating lease cost	$ 61.6
Variable lease cost	8.6
Finance lease cost	0.1
Sublease income	(1.4)
Net lease cost	68.9
Lease ROU assets:
Operating lease	276.6
Finance lease	2.6
Lease liabilities:
Operating lease	307.9
Finance lease	5.3
Cash payments included in the measurement of lease liabilities:
Reported in operating cash from operating leases	61.7
Reported in financing cash from finance leases	0.1
ROU assets obtained in exchange for lessee:
Operating lease liabilities	89.1
Finance lease liabilities	$ 2.6
Weighted-average discount rate:
Operating leases	3.13%
Finance leases	2.58%
Weighted-average remaining lease term (in years):
Operating leases	7 years 8 months 12 days
Finance leases	12 years 2 months 12 days