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Debt - Other (Details) $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Jan. 15, 2023 USD ($) | Sep. 03, 2020 USD ($) | Dec. 31, 2023 USD ($) item | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Debt |  |  |  |  |
Total |  |  | $ 1,151.4 | $ 1,659.6 |
Weighted average interest rate (as a percent) |  |  | 2.88% | 3.37% |
Principal payment on long-term debt |  |  | $ 506.1 | $ 0.3 | $ 20.7
Number of financial maintenance covenants | item |  |  | 2 |  |
Aggregate maturities of long-term debt for each of the next five years and thereafter |  |  |  |  |
2024 |  |  | $ 0.3 |  |
2025 |  |  | 400.3 |  |
2026 |  |  | 0.4 |  |
2027 |  |  | 0.4 |  |
2028 |  |  | 0.0 |  |
Thereafter |  |  | 750.0 |  |
Total |  |  | 1,151.4 | 1,659.6 |
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) |  |  | 0.175% |  |
Letters of credit outstanding |  |  | $ 1.4 | 7.7 |
Aggregate maturities of long-term debt for each of the next five years and thereafter |  |  |  |  |
Total |  |  | $ 0.0 | 0.0 |
Unsecured revolving credit facility maturing September 3, 2025 | SOFR |  |  |  |  |
Debt |  |  |  |  |
Variable interest rate |  |  | SOFR |  |
Interest rate added to base (as a percent) |  |  | 1.10% |  |
Unsecured revolving credit facility maturing September 3, 2025 | Bank prime rate |  |  |  |  |
Debt |  |  |  |  |
Variable interest rate |  |  | bank prime rate |  |
Senior Unsecured Notes - Publicly Traded |  |  |  |  |
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, interest payable semi-annually at 4.50%, effective rate of 4.63%, redeemed on January 15, 2023 |  |  |  |  |
Debt |  |  |  |  |
Total |  |  | $ 0.0 | $ 500.0 |
Semi-annual rate (as a percent) | 4.50% |  | 4.50% | 4.50% |
Principal payment on long-term debt | $ 500.0 |  |  |  |
Aggregate maturities of long-term debt for each of the next five years and thereafter |  |  |  |  |
Total |  |  | $ 0.0 | $ 500.0 |
Senior unsecured notes, interest payable semi-annually at 1.30%, effective rate of 1.53%, maturing August 15, 2025 |  |  |  |  |
Debt |  |  |  |  |
Total |  |  | $ 400.0 | $ 400.0 |
Semi-annual rate (as a percent) |  |  | 1.30% | 1.30% |
Aggregate maturities of long-term debt for each of the next five years and thereafter |  |  |  |  |
Total |  |  | $ 400.0 | $ 400.0 |
Senior unsecured notes, interest payable semi-annually at 2.15%, effective rate of 2.27%, maturing August 15, 2030 |  |  |  |  |
Debt |  |  |  |  |
Total |  |  | $ 500.0 | $ 500.0 |
Semi-annual rate (as a percent) |  |  | 2.15% | 2.15% |
Aggregate maturities of long-term debt for each of the next five years and thereafter |  |  |  |  |
Total |  |  | $ 500.0 | $ 500.0 |
Senior unsecured notes, interest payable semi-annually at 6.85%, effective rate of 6.91%, maturing November 15, 2036 |  |  |  |  |
Debt |  |  |  |  |
Total |  |  | $ 250.0 | $ 250.0 |
Semi-annual rate (as a percent) |  |  | 6.85% | 6.85% |
Aggregate maturities of long-term debt for each of the next five years and thereafter |  |  |  |  |
Total |  |  | $ 250.0 | $ 250.0 |
Other separate revolving credit facilities | Asia |  |  |  |  |
Debt |  |  |  |  |
Maximum borrowing capacity |  |  | 7.7 |  |
Lines of credit |  |  | 0.0 | 2.2 |
IRB |  |  |  |  |
Debt |  |  |  |  |
Total |  |  | 1.4 | 7.4 |
Aggregate maturities of long-term debt for each of the next five years and thereafter |  |  |  |  |
Total |  |  | 1.4 | 7.4 |
Letter of Credit | Standby Facility |  |  |  |  |
Debt |  |  |  |  |
Maximum borrowing capacity |  |  | 50.0 | 50.0 |
Letters of credit outstanding |  |  | $ 40.9 | $ 18.7 |

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