Debt - Summary (Details) - USD ($) $ in Millions	Jan. 15, 2023	Dec. 31, 2022	Dec. 31, 2021
Debt
Total		$ 1,659.6	$ 1,662.4
Less: unamortized discount and debt issuance costs		(12.0)	(15.4)
Less: amounts due within one year and short-term borrowings		(508.2)	(5.0)
Total long-term debt		1,139.4	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%, redeemed on January 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%
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%
Effective rate (as a percent)		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%
Effective rate (as a percent)		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%
Effective rate (as a percent)		6.91%
Other notes and revolving credit facilities
Debt
Total		$ 9.6	$ 12.4