Commitments and Contingencies (Future Minimum Lease Payments) (Details) $ in Millions		12 Months Ended
	Mar. 01, 2019 ft²	Dec. 31, 2023 USD ($) lease	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Finance Lease, Right-of-Use Asset, Amortization		$ 14.5	$ 13.2	$ 11.9
Finance Lease, Interest Expense		1.7	0.7	0.5
Operating Lease, Cost		74.1	67.7	62.2
Short-term Lease, Cost		5.3	5.0	3.8
Variable Lease, Cost		26.8	24.5	21.6
Lease, Cost		122.4	111.1	100.0
Finance Lease, Right-of-Use Asset		38.4	33.3
Right-of-use assets from operating leases		213.6	219.9
Finance lease obligations		12.1	11.2
Finance Lease, Liability, Noncurrent		32.7	28.3
Current operating lease liabilities		57.5	63.3
Long-term operating lease liabilities		$ 164.6	$ 161.8
Finance Lease, Weighted Average Remaining Lease Term		3 years 4 months 24 days	3 years 7 months 6 days
Operating Lease, Weighted Average Remaining Lease Term		5 years	5 years 1 month 6 days
Finance Lease, Weighted Average Discount Rate, Percent		4.30%	1.92%
Operating Lease, Weighted Average Discount Rate, Percent		4.14%	3.44%
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]		Total property, plant and equipment, net	Total property, plant and equipment, net
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]		Long-Term Debt and Lease Obligation, Current	Long-Term Debt and Lease Obligation, Current
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]		Total long-term debt	Total long-term debt
Operating Lease, Payments		$ 70.5	$ 66.0	61.8
Finance Lease, Principal Payments		15.8	13.6	12.3
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability		21.3	14.4	14.6
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability		56.4	$ 98.8	$ 61.8
Area of Leased Office Building | ft²	192,000
Operating Leases
2024		64.6
2025		51.6
2026		42.9
2027		31.6
2028		22.0
Thereafter		33.5
Total minimum lease payments		246.2
Less imputed interest		(24.1)
Present value of minimum payments		222.1
Finance Leases
2024		13.4
2025		10.8
2026		6.8
2027		3.1
2028		13.1
Thereafter		0.0
Total minimum lease payments		47.2
Less imputed interest		(2.4)
Present value of minimum payments		$ 44.8
Number of leases | lease		3
Leases not yet commenced, amount		$ 46.1