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Debt (Tables)
 9 Months Ended
Sep. 30, 2023
Debt Disclosure [Abstract]  
Summary of Debt

At September 30, 2023 and December 31, 2022, our long-term debt and interest rates on that debt were as follows (dollars in millions):

 

 

 

September 30,

 

 

December 31,

 

 

 

 

2023

 

 

2022

 

 

Revolving Credit Facility

 

$

—

 

 

$

—

 

 

3.65% Senior Notes, net of discount of $0.1 million and
   $0.2 million as of September 30, 2023 and December 31, 2022,
   respectively, due September 2024

 

 

399.9

 

 

 

399.8

 

 

3.40% Senior Notes, net of discount of $0.8 million and
   $0.9 million as of September 30, 2023 and December 31, 2022,
   respectively, due December 2027

 

 

499.2

 

 

 

499.1

 

 

3.00% Senior Notes, net of discount of $0.4 million and
   $0.5 million as of September 30, 2023 and December 31, 2022,
   respectively, due December 2029

 

 

499.6

 

 

 

499.5

 

 

4.05% Senior Notes, net of discount of $3.3 million as
   of both September 30, 2023 and December 31, 2022,
   due December 2049

 

 

396.7

 

 

 

396.7

 

 

3.05% Senior Notes, net of discount of $3.5 million and
   $3.6 million as of September 30, 2023 and December 31, 2022,
   respectively, due October 2051

 

 

696.5

 

 

 

696.4

 

 

Total

 

 

2,491.9

 

 

 

2,491.5

 

 

Less current portion (a)

 

 

399.5

 

 

 

—

 

 

Less unamortized debt issuance costs

 

 

16.7

 

 

 

17.9

 

 

Total long-term debt

 

$

2,075.7

 

 

$

2,473.6

 

 
(a)
The current portion of long-term debt excludes unamortized debt issuance costs of $0.4 million at September 30, 2023.