Leases (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Loss Contingencies [Line Items]
Operating Lease, Liability	$ 220.2	$ 222.1
Retained earnings	$ 5,644.3	$ 5,321.8
Operating Lease, Weighted Average Discount Rate, Percent	5.49%	5.27%
Operating Lease, Weighted Average Remaining Lease Term	6 years 10 months 24 days	7 years
Fixed lease payments	$ 60.6	$ 64.0	$ 65.0
Lessee, Operating Lease, Liability, to be Paid, Year One	58.1	58.8
Lessee, Operating Lease, Liability, Payments, Due Year Two	51.0	50.6
Lessee, Operating Lease, Liability, Payments, Due Year Three	38.1	42.7
Lessee, Operating Lease, Liability, Payments, Due Year Four	29.0	30.1
Lessee, Operating Lease, Liability, Payments, Due Year Five	22.0	21.4
Lessee, Operating Lease, Liability, Payments, Due after Year Five	82.1	79.3
Lessee, Operating Lease, Liability, Payments, Due	280.6	283.1
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	60.4	60.9
Rental expense for leased premises	$ 76.3	$ 76.2	$ 75.6
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration]	Other liabilities	Other liabilities
Accounting Standards Update 2016-02 [Member]
Loss Contingencies [Line Items]
Operating Lease, Right-of-Use Asset	$ 194.4	$ 199.6