DEBT AND INTEREST (Tables)

12 Months Ended

Dec. 31, 2019

Schedule of short-term debt obligations

	2019				2018
			Average				Average
	Carrying		Interest		Carrying		Interest
(millions)	Value		Rate		Value		Rate
Short-term debt
Commercial paper		$55.1	(0.30)	%		$165.4	0.18	%
Notes payable		24.5	3.53	%		175.9	1.44	%
Long-term debt, current maturities		300.9				401.4
Total		$380.5				$742.7

Schedule of long-term debt obligations including current maturities

		2019								2018
				Stated		Effective				Stated		Effective
	Maturity	Carrying		Interest		Interest		Carrying		Interest		Interest
(millions)	by Year	Value		Rate		Rate		Value		Rate		Rate
Long-term debt
Public notes (2019 principal amount)
Three year 2016 senior notes ($400 million)	2019		$ -	-	%	-	%		$399.7	2.00	%	3.24	%
Five year 2015 senior notes ($300 million)	2020		300.0	2.25	%	2.79	%		299.5	2.25	%	2.79	%
Ten year 2011 senior notes ($1.02 billion)	2021		1,018.3	4.35	%	4.43	%		1,017.6	4.35	%	4.43	%
Five year 2017 senior notes ($500 million)	2022		497.8	2.38	%	2.55	%		496.9	2.38	%	2.55	%
Seven year 2016 senior notes ($400 million)	2023		398.5	3.25	%	3.49	%		398.0	3.25	%	3.49	%
Seven year 2016 senior notes (€575 million)	2024		628.4	1.00	%	1.10	%		644.1	1.00	%	1.09	%
Ten year 2015 senior notes (€575 million)	2025		630.0	2.63	%	2.96	%		646.3	2.63	%	2.94	%
Ten year 2016 senior notes ($750 million)	2026		744.5	2.70	%	2.93	%		743.8	2.70	%	2.93	%
Ten year 2017 senior notes ($500 million)	2027		495.4	3.25	%	3.37	%		494.8	3.25	%	3.37	%
Thirty year 2011 senior notes ($458 million)	2041		451.9	5.50	%	5.56	%		451.6	5.50	%	5.56	%
Thirty year 2016 senior notes ($250 million)	2046		246.2	3.70	%	3.76	%		246.1	3.70	%	3.76	%
Thirty year 2017 senior notes ($700 million)	2047		610.4	3.95	%	4.15	%		609.0	3.95	%	4.14	%
Private notes (2019 principal amount)
Series B private placement senior notes ($250 million)	2023		249.6	4.32	%	4.36	%		249.4	4.32	%	4.36	%
Finance lease obligations and other			3.0						6.1
Total debt			6,274.0						6,702.9
Long-term debt, current maturities			(300.9)						(401.4)
Total long-term debt			$5,973.1						$6,301.5

Schedule of aggregate annual maturities of long-term debt

(millions)
2020	$ 301
2021	1,020
2022	498
2023	648
2024	628

Schedule of interest expense and interest income

(millions)	2019		2018		2017
Interest expense		$214.4		$235.5		$272.2
Interest income		(23.7)		(14.4)		(17.6)
Interest expense, net		$190.7		$221.1		$254.6