Operating Leases (Details) $ in Millions	9 Months Ended
	Sep. 30, 2020 USD ($) lease_renewal_option
Lessee, Lease, Description [Line Items]
Weighted-average remaining lease term	5 years 10 months 9 days
Number of lease renewal options (at least) | lease_renewal_option	1
Right-of-use asset	$ 307.4
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:OtherAssets
Lease liability	$ 335.0
Operating Lease, Liability, Statement of Financial Position [Extensible List]	us-gaap:AccountsPayableAndAccruedLiabilitiesCurrentAndNoncurrent
Weighted average discount rate for the operating leases (percent)	3.37%
Expected lease obligation for lease not yet commenced	$ 232.5
Expected lease term	15 years
Minimum
Lessee, Lease, Description [Line Items]
Renewal lease terms	1 year
Options to terminate leases within period	1 year
Maximum
Lessee, Lease, Description [Line Items]
Renewal lease terms	10 years
Options to terminate leases within period	8 years 6 months