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DEBT - Schedule of long-term debt (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Jan. 29, 2021	Dec. 31, 2020	Oct. 31, 2013	Jun. 30, 2012
Debt Instrument [Line Items]
Unamortized debt issuance costs and discounts	$ (8.1)	$ (10.4)
Total debt	1,067.3	1,366.6
Less: current borrowings	153.8	367.3
Long-term debt	$ 913.5	$ 999.3
Senior notes \| 6.50% Senior notes due 2026
Debt Instrument [Line Items]
Interest rate, stated percentage	6.50%	6.50%	6.50%
Long-term debt, gross	$ 202.9	$ 202.9
Unsecured debt \| 3.40% 2012 Private placement notes due 2022
Debt Instrument [Line Items]
Interest rate, stated percentage		3.40%				3.40%
Unsecured debt \| 3.15% 2013 Private Placement Notes due 2023
Debt Instrument [Line Items]
Interest rate, stated percentage	3.15%	3.15%			3.15%
Long-term debt, gross	$ 0.0	$ 272.2
Unsecured debt \| 5.75% 2020 Private Placement Notes due 2025
Debt Instrument [Line Items]
Interest rate, stated percentage	5.75%	5.75%		5.75%
Long-term debt, gross	$ 221.0	$ 213.5
Unsecured debt \| 4.00% 2012 Private Placement Notes due 2027
Debt Instrument [Line Items]
Interest rate, stated percentage	4.00%	4.00%				4.00%
Long-term debt, gross	$ 82.9	$ 80.1
Unsecured debt \| 4.00% 2012 Private Placement Notes due 2032
Debt Instrument [Line Items]
Interest rate, stated percentage	4.00%	4.00%				4.00%
Long-term debt, gross	$ 110.5	$ 106.7
Unsecured debt \| 3.75% 2013 Private Placement Notes due 2033
Debt Instrument [Line Items]
Interest rate, stated percentage	3.75%	3.75%			3.75%
Long-term debt, gross	$ 110.5	$ 106.7
Bank borrowings and other
Debt Instrument [Line Items]
Long-term debt, gross	$ 347.6	$ 394.9