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Debt, U.S. Senior Notes (Details) - USD ($) $ in Millions |  |  | 6 Months Ended |
--- | --- | --- | --- | ---
Apr. 01, 2020 | Feb. 20, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Debt |  |  |  |  |
Repayments of long-term debt |  |  | $ 387.1 | $ 401.3 |
U.S. Senior Notes |  |  |  |  |
Debt |  |  |  |  |
Redemption price as a percentage of principal amount |  |  | 100.00% |  |
Debt instrument, covenant compliance |  |  | At June 30, 2021, the Company was in compliance with the financial covenants under its U.S. Senior Notes. |  |
2.20% Senior Notes due April 2020 |  |  |  |  |
Debt |  |  |  |  |
Stated interest rate (as a percent) | 2.20% |  |  |  |
Repayments of long-term debt | $ 400.0 |  |  |  |
4.350% Senior Notes due June 2029 |  |  |  |  |
Debt |  |  |  |  |
Stated interest rate (as a percent) |  |  | 4.35% |  | 4.35%
2.800% Senior Notes due February 2030 |  |  |  |  |
Debt |  |  |  |  |
Stated interest rate (as a percent) |  |  | 2.80% |  | 2.80%
3.125% Senior Notes due September 2021 |  |  |  |  |
Debt |  |  |  |  |
Stated interest rate (as a percent) |  |  | 3.125% |  | 3.125%
4.00% Senior Notes due February 2022 |  |  |  |  |
Debt |  |  |  |  |
Stated interest rate (as a percent) |  |  | 4.00% |  | 4.00%
3.20% Senior Notes due April 2024 |  |  |  |  |
Debt |  |  |  |  |
Stated interest rate (as a percent) |  |  | 3.20% |  | 3.20%
2.05% Senior Notes due March 2025 |  |  |  |  |
Debt |  |  |  |  |
Redemption price as a percentage of principal amount |  | 100.00% |  |  |
Debt instrument, principal amount |  | $ 400.0 |  |  |
Stated interest rate (as a percent) |  | 2.05% | 2.05% |  | 2.05%
Debt instrument, face amount, net of discount (as a percent) |  | 99.829% |  |  |
Debt maturity date |  |  | Mar. 01, 2025 |  |

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