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LONG-TERM DEBT (Tables)
12 Months Ended
Dec. 31, 2019
Debt Disclosure [Abstract]  
Schedule of long-term debt instruments

The following table is a summary of our long-term debt outstanding (excluding finance leases) as of December 31:
(in millions)
 
2019
 
2018
Long-term debt
 
Interest Rate
 
Year Due
 
 
 
 
Senior Notes (unsecured)
 
3.35%
 
2021
 
400.0

 
400.0

 
 
6.08%
 
2028
 
50.0

 
50.0

 
 
5.55%
 
2036
 
125.0

 
125.0

 
 
3.671%
 
2042
 
300.0

 
300.0

 
 
4.752%
 
2044
 
450.0

 
450.0

 
 
3.30%
 
2049
 
300.0

 

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



*
The amount of long-term debt on our balance sheet includes finance lease obligations of $30.7 million at December 31, 2019.
Schedule of maturities of long-term debt
The following table shows the future maturities of our long-term debt outstanding (excluding obligations under finance leases) as of December 31, 2019:
(in millions)
 
Payments
2020
 
$

2021
 
400.0

2022
 

2023
 

2024
 

Thereafter
 
1,225.0

Total
 
$
1,625.0