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Debt (Tables)
 6 Months Ended
Jun. 30, 2021
Debt Disclosure [Abstract]  
Summary of Debt

At June 30, 2021 and December 31, 2020, our long-term debt and interest rates on that debt were as follows (dollars in millions):

 

 

 

June 30, 2021

 

 

December 31, 2020

 

 

 

Amount

 

 

Interest Rate

 

 

Amount

 

 

Interest Rate

 

Revolving Credit Facility, due August 2021, terminated June 2021

 

$

—

 

 

 

—

%

 

$

—

 

 

 

—

%

Revolving Credit Facility, due June 2026

 

 

—

 

 

 

—

%

 

 

—

 

 

 

—

%

4.50% Senior Notes, net of discount of $0.5 million and
   $0.6 million as of June 30, 2021 and December 31, 2020,
   respectively, due November 2023

 

 

699.5

 

 

 

4.50

%

 

 

699.4

 

 

 

4.50

%

3.65% Senior Notes, net of discount of $0.4 million and
   $0.5 million as of June 30, 2021 and December 31, 2020,
   respectively, due September 2024

 

 

399.6

 

 

 

3.65

%

 

 

399.5

 

 

 

3.65

%

3.40% Senior Notes, net of discount of $1.1 million and
   $1.2 million as of June 30, 2021 and December 31, 2020,
   respectively, due December 2027

 

 

498.9

 

 

 

3.40

%

 

 

498.8

 

 

 

3.40

%

3.00% Senior Notes, net of discount of $0.6 million as of
   both June 30, 2021 and December 31, 2020, due December 2029

 

 

499.4

 

 

 

3.00

%

 

 

499.4

 

 

 

3.00

%

4.05% Senior Notes, net of discount of $3.4 million as of
   both June 30, 2021 and December 31, 2020, due December 2049

 

 

396.6

 

 

 

4.05

%

 

 

396.6

 

 

 

4.05

%

Total

 

 

2,494.0

 

 

 

3.77

%

 

 

2,493.7

 

 

 

3.77

%

Less unamortized debt issuance costs

 

 

14.2

 

 

 

 

 

 

14.3

 

 

 

 

Total long-term debt

 

$

2,479.8

 

 

 

3.77

%

 

$

2,479.4

 

 

 

3.77

%