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v3.21.2

Lines of Credit and Financing Arrangements (Senior Unsecured Notes) (Details) - Senior Unsecured Notes [Member] | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2021 USD ($) | Jul. 30, 2020 USD ($) | Nov. 01, 2016 USD ($) debtSeries
Debt Instrument [Line Items] |  |  |  |
Fixed interest rate for senior unsecured notes (as a percent) |  |  |  | 3.00%
Maturity date of senior unsecured notes | Nov. 15, 2023 |  |  |
Minimum principal amount accelerated |  | $ 75,000,000.0 |  |
Notice period |  | 30 days |  |
2025 Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior unsecured notes |  |  | $ 300,000,000.0 |
Fixed interest rate for senior unsecured notes (as a percent) |  |  | 1.35% |
2027 Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior unsecured notes |  |  | $ 300,000,000.0 |
Fixed interest rate for senior unsecured notes (as a percent) |  |  | 1.70% |
2023 Notes [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Number of senior unsecured notes | debtSeries |  |  |  | 2
Senior unsecured notes |  |  |  | $ 350,000,000.0

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