Debt - Summary (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Debt
Total	$ 1,661.2	$ 1,662.4
Less: unamortized discount and debt issuance costs	(12.9)	(15.4)
Less: amounts due within one year and short-term borrowings	(509.5)	(5.0)
Total long-term debt	1,138.8	1,642.0
Unsecured revolving credit facility maturing September 3, 2025
Debt
Total	0.0	0.0
Senior unsecured notes, interest payable semi-annually at 4.50%, effective rate of 4.63%, maturing April 15, 2023
Debt
Total	$ 500.0	$ 500.0
Semi-annual rate (as a percent)	4.50%	4.50%
Effective rate (as a percent)	4.63%	4.63%
Senior unsecured notes, interest payable semi-annually at 1.30%, effective rate of 1.53%, maturing August 15, 2025
Debt
Total	$ 400.0	$ 400.0
Semi-annual rate (as a percent)	1.30%	1.30%
Effective rate (as a percent)	1.53%	1.53%
Senior unsecured notes, interest payable semi-annually at 2.15%, effective rate of 2.27%, maturing August 15, 2030
Debt
Total	$ 500.0	$ 500.0
Semi-annual rate (as a percent)	2.15%	2.15%
Effective rate (as a percent)	2.27%	2.27%
Senior unsecured notes, interest payable semi-annually at 6.85%, effective rate of 6.91%, maturing November 15, 2036
Debt
Total	$ 250.0	$ 250.0
Semi-annual rate (as a percent)	6.85%	6.85%
Effective rate (as a percent)	6.91%	6.91%
Other notes and revolving credit facilities
Debt
Total	$ 11.2	$ 12.4