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Debt (Tables) | 12 Months Ended
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Dec. 31, 2021
Debt Disclosure [Abstract] |
Summary of Debt | At December 31, 2021 and 2020, our long-term debt and interest rates on that debt were as follows (dollars in millions):
|  | December 31, 2021 |  |  | December 31, 2020 |  |
|  | Amount |  |  | Amount |  |
Revolving Credit Facility |  | $ | — |  |  | $ | — |  |
4.50% Senior Notes, net of discount of $0.6 million as of December 31, 2020, due November 2023 |  |  | — |  |  |  | 699.4 |  |
3.65% Senior Notes, net of discount of $0.4 million and $0.5 million as of December 31, 2021 and 2020, respectively, due September 2024 |  |  | 399.6 |  |  |  | 399.5 |  |
3.40% Senior Notes, net of discount of $1.0 million and $1.2 million as of December 31, 2021 and 2020, respectively, due December 2027 |  |  | 499.0 |  |  |  | 498.8 |  |
3.00% Senior Notes, net of discount of $0.5 million and $0.6 million as of December 31, 2021 and 2020, respectively, due December 2029 |  |  | 499.5 |  |  |  | 499.4 |  |
4.05% Senior Notes, net of discount of $3.4 million as of both December 31, 2021 and 2020, due December 2049 |  |  | 396.6 |  |  |  | 396.6 |  |
3.05% Senior Notes, net of discount of $3.7 million as of December 31, 2021, due October 2051 |  |  | 696.3 |  |  |  | — |  |
Total |  |  | 2,491.0 |  |  |  | 2,493.7 |  |
Less unamortized debt issuance costs |  |  | 19.5 |  |  |  | 14.3 |  |
Total long-term debt |  | $ | 2,471.5 |  |  | $ | 2,479.4 |  |

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