Leases (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2019
Lessee, Lease, Description [Line Items]
Operating lease right-of-use assets	$ 206.8			$ 175.0
Operating lease, liability	213.9			$ 175.0
Operating lease cost	80.0
Operating lease cost		$ 64.0	$ 46.0
Operating lease payments	65.0
ROU assets obtained in exchange for operating lease liabilities	$ 80.0
Weighted average lease term of operating leases	7 years 1 month 6 days
Weighted average discount rate of operating leases (as a percent)	3.40%
Fixed payments of leases not yet commenced	$ 22.0
Minimum
Lessee, Lease, Description [Line Items]
Term of contract for operating leases for which lease term has not yet commenced	1 year
Maximum
Lessee, Lease, Description [Line Items]
Period to terminate lease (less than)	1 year
Period to extend lease	15 years
Term of contract for operating leases for which lease term has not yet commenced	15 years
Acquisitions, ASP
Lessee, Lease, Description [Line Items]
ROU assets obtained in exchange for operating lease liabilities	$ 31.0