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External Debt and Financing Arrangements (Tables) | 9 Months Ended
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Sep. 30, 2021
Debt Disclosure [Abstract] |
Summary of Outstanding Notes | The following table provides a summary of the Company’s outstanding Notes, including the net carrying value of the Notes, net of underwriting commissions, price discounts, and debt issuance costs as of September 30, 2021 and December 31, 2020:
|  |  |  |  |  |  |  |  | Net Carrying Value |
(in millions) | Principal Amount |  |  | Issuance Date |  | Maturity Date |  | September 30, 2021 |  |  | December 31, 2020 |
4.000% Senior Notes | $ | 500.0 |  |  | June 2015 |  | June 2025 |  | $ | 497.2 |  |  | $ | 496.6 |
4.000% Senior Notes (the "2018 Notes") |  | 600.0 |  |  | September 2018 |  | September 2023 |  |  | 597.9 |  |  |  | 597.1 |
3.250% Senior Notes (the "2019 Notes") |  | 700.0 |  |  | September 2019 |  | September 2029 |  |  | 694.0 |  |  |  | 693.5 |
Total Senior Notes | $ | 1,800.0 |  |  |  |  |  |  | $ | 1,789.1 |  |  | $ | 1,787.2 |

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