LONG-TERM DEBT (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Total	$ 1,625.0	$ 1,325.0
Unamortized debt issuance costs	(12.0)	(9.6)
Unamortized discount, net	(0.9)	(0.7)
Total long-term debt	1,612.1	1,314.7
Finance lease obligations	30.7
Long-term Debt, Fiscal Year Maturity
2020	0.0
2021	400.0
2022	0.0
2023	0.0
2024	0.0
Thereafter	1,225.0
Total	$ 1,625.0	1,325.0
Senior Notes (unsecured), 3.35% due 2021
Debt Instrument [Line Items]
Interest rate, (as a percent)	3.35%
Senior Notes (unsecured)	$ 400.0	400.0
Senior Notes (unsecured), 6.08% due 2028
Debt Instrument [Line Items]
Interest rate, (as a percent)	6.08%
Senior Notes (unsecured)	$ 50.0	50.0
Senior Notes (unsecured), 5.55% due 2036
Debt Instrument [Line Items]
Interest rate, (as a percent)	5.55%
Senior Notes (unsecured)	$ 125.0	125.0
Senior Notes (unsecured), 3.671% due 2042
Debt Instrument [Line Items]
Interest rate, (as a percent)	3.671%
Senior Notes (unsecured)	$ 300.0	300.0
Senior Notes (unsecured), 4.752% due 2044
Debt Instrument [Line Items]
Interest rate, (as a percent)	4.752%
Senior Notes (unsecured)	$ 450.0	450.0
Senior Notes (unsecured), 3.30% due 2049
Debt Instrument [Line Items]
Interest rate, (as a percent)	3.30%
Senior Notes (unsecured)	$ 300.0	$ 0.0
Proceeds from Issuance of Debt	$ 300.0