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Financing Arrangements - Credit Agreement (Details) - USD ($) |  |  |  | 1 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 18, 2020 | Apr. 24, 2020 | Feb. 12, 2016 | Feb. 29, 2016 | Dec. 31, 2020 | Apr. 23, 2020 | Dec. 31, 2019 | Apr. 24, 2016 | Apr. 23, 2016
Credit Agreement |  |  |  |  |  |  |  |  |
Borrowings outstanding |  |  |  |  | $ 200,000,000.0 |  | $ 310,000,000.0 |  |
Term Loan due February 2021 |  |  |  |  |  |  |  |  |
Credit Agreement |  |  |  |  |  |  |  |  |
Borrowings outstanding |  |  |  |  |  |  | 225,000,000.0 |  |
Letters of credit |  |  |  |  |  |  |  |  |
Credit Agreement |  |  |  |  |  |  |  |  |
Term of debt |  |  |  |  | 1 year |  |  |  |
Stand-by letters of credit outstanding |  |  |  |  | $ 16,200,000 |  | 25,800,000 |  |
5.05% Senior notes due 2020 |  |  |  |  |  |  |  |  |
Credit Agreement |  |  |  |  |  |  |  |  |
Borrowings outstanding |  |  |  |  |  |  | $ 75,000,000.0 |  |
Interest rate (as a percent) |  |  |  |  |  |  | 5.05% |  |
Credit Agreement |  |  |  |  |  |  |  |  |
Credit Agreement |  |  |  |  |  |  |  |  |
Borrowing capacity |  | $ 100,000,000 |  |  |  |  |  |  |
Term of debt |  |  | 5 years |  |  |  |  |  |
Sublimit on letters of credit |  |  | $ 100,000,000 |  |  |  |  |  |
Eurocurrency rate loans | LIBOR |  |  |  |  |  |  |  |  |
Credit Agreement |  |  |  |  |  |  |  |  |
Minimum base rate (as a percent) |  | $ 1.00 |  |  |  |  |  |  |
Eurocurrency rate loans | LIBOR | Minimum |  |  |  |  |  |  |  |  |
Credit Agreement |  |  |  |  |  |  |  |  |
Interest rate added to base rate (as a percent) |  | 1.50% |  |  |  |  |  |  |
Eurocurrency rate loans | LIBOR | Maximum |  |  |  |  |  |  |  |  |
Credit Agreement |  |  |  |  |  |  |  |  |
Interest rate added to base rate (as a percent) |  | 2.10% |  |  |  |  |  |  |
Base rate loans and swing line loans |  |  |  |  |  |  |  |  |
Credit Agreement |  |  |  |  |  |  |  |  |
Minimum base rate (as a percent) |  | $ 2.00 |  |  |  |  |  |  |
Base rate loans and swing line loans | LIBOR |  |  |  |  |  |  |  |  |
Credit Agreement |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  | 1.00% |  |  |  |  |  |  |
Base rate loans and swing line loans | Prime Rate |  |  |  |  |  |  |  |  |
Credit Agreement |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  | 0.50% |  |  |  |  |  |  |
Revolving credit facility |  |  |  |  |  |  |  |  |
Credit Agreement |  |  |  |  |  |  |  |  |
Borrowing capacity |  | $ 800,000,000 | $ 500,000,000 |  |  | $ 500,000,000 |  | $ 800,000,000 | $ 500,000,000
Extension period |  | 1 year |  |  |  |  |  |  |
Interest rate on revolving credit facility (as a percent) |  |  |  |  | 2.50% |  |  |  |
Amount drawn |  |  |  |  | $ 200,000,000.0 |  |  |  |
Unused and available credit under the credit agreement |  |  |  |  | 583,800,000 |  |  |  |
Stand-by letters of credit outstanding |  |  |  |  | $ 16,200,000 |  |  |  |
Term loan facility | Term Loan due February 2021 |  |  |  |  |  |  |  |  |
Credit Agreement |  |  |  |  |  |  |  |  |
Term of debt |  |  | 5 years |  |  |  |  |  |
Face amount |  |  | $ 300,000,000 |  |  |  |  |  |
Amount drawn |  |  |  | $ 300,000,000 |  |  |  |  |
Notes Purchase Agreement 2010 | Revolving credit facility |  |  |  |  |  |  |  |  |
Credit Agreement |  |  |  |  |  |  |  |  |
Repayment of debt | $ 35,000,000.0 |  |  |  |  |  |  |  |
Notes Purchase Agreement 2010 | Senior notes |  |  |  |  |  |  |  |  |
Credit Agreement |  |  |  |  |  |  |  |  |
Face amount | 75,000,000.0 |  |  |  |  |  |  |  |
Amount drawn | $ 40,000,000.0 |  |  |  |  |  |  |  |
Swing Line Loans |  |  |  |  |  |  |  |  |
Credit Agreement |  |  |  |  |  |  |  |  |
Borrowing capacity |  | $ 15,000,000 |  |  |  |  |  |  |

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