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v3.21.2

Debt - Other (Details) $ in Millions |  |  |  |  | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 03, 2020 USD ($) | Aug. 03, 2020 USD ($) | Apr. 12, 2013 USD ($) | Nov. 20, 2006 USD ($) | Sep. 30, 2021 USD ($) item | Dec. 31, 2020 USD ($) | Nov. 15, 2016 USD ($)
Debt |  |  |  |  |  |  |
Total |  |  |  |  | $ 1,662.6 | $ 1,663.7 |
Number of financial maintenance covenants | item |  |  |  |  | 2 |  |
Unsecured revolving credit facility maturing September 3, 2025 |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Maximum borrowing capacity | $ 1,500.0 |  |  |  |  |  |
Debt term | 5 years |  |  |  |  |  |
Total |  |  |  |  | $ 0.0 | 0.0 |
Commitment fee on unused portion of revolving credit facility (as a percent) |  |  |  |  | 0.20% |  |
Letters of credit outstanding |  |  |  |  | $ 16.0 |  |
Unsecured revolving credit facility maturing September 3, 2025 | LIBOR |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Variable interest rate |  |  |  |  | LIBOR |  |
Interest rate added to base (as a percent) |  |  |  |  | 1.25% |  |
Unsecured revolving credit facility maturing September 3, 2025 | Bank prime rate |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Variable interest rate |  |  |  |  | bank prime rate |  |
Interest rate added to base (as a percent) |  |  |  |  | 0.25% |  |
Senior Unsecured Notes |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Percentage of principal amount at which the notes may be required to be repurchased in event of a change of control and a downgrade of the entity's credit rating |  |  |  |  | 101.00% |  |
Senior unsecured notes issued November 20, 2006 |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Issuance of debt |  |  |  | $ 600.0 |  |  |
Senior unsecured notes due November 15, 2016 |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Total |  |  |  |  |  |  | $ 0.0
Interest rate (as a percent) |  |  |  | 6.20% |  |  |
Lump sum payment on maturity |  |  |  |  |  |  | $ 350.0
Issuance of debt |  |  |  | $ 350.0 |  |  |
Senior unsecured notes issued August 3, 2020 |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Issuance of debt |  | $ 900.0 |  |  |  |  |
Senior unsecured notes due August 15, 2025 |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Interest rate (as a percent) |  | 1.30% |  |  |  |  |
Issuance of debt |  | $ 400.0 |  |  |  |  |
Senior unsecured notes due August 15, 2030 |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Interest rate (as a percent) |  | 2.15% |  |  |  |  |
Issuance of debt |  | $ 500.0 |  |  |  |  |
Senior unsecured notes due April 15, 2023 |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Total |  |  |  |  | $ 500.0 | 500.0 |
Interest rate (as a percent) |  |  | 4.50% |  |  |  |
Issuance of debt |  |  | $ 500.0 |  |  |  |
Senior unsecured notes due November 15, 2036 |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Total |  |  |  |  | 250.0 | 250.0 |
Interest rate (as a percent) |  |  |  | 6.85% |  |  |
Issuance of debt |  |  |  | $ 250.0 |  |  |
Other notes and revolving credit facilities |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | 13.4 |  |
Total |  |  |  |  | 4.6 | 5.4 |
IRB |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Total |  |  |  |  | 8.0 | $ 8.3 |
Letter of Credit | Credit Agreement |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  | 50.0 |  |
Letters of credit outstanding |  |  |  |  | $ 23.0 |  |

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