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v3.20.4

Debt (5.125% Senior Notes) (Details) - Senior Notes - 5.125% Senior Notes due 2023 - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Mar. 19, 2013
Debt Instrument [Line Items] |  |  |
Stated interest rate | 5.125% | 5.125% | 5.125%
Debt instrument, face amount |  |  | $ 300,000,000.0
Debt instrument, coupon rate | 5.125% |  |
Debt instrument, yield to maturity | 5.125% |  |
Debt instrument, payment terms | Interest is payable semi-annually on April 1 and October 1 each year, beginning October 1, 2013. |  |
Debt instrument, frequency of payment | semi-annually |  |
Debt instrument, commencement date of first required payment | Oct. 01, 2013 |  |
Debt instrument, maturity date | Apr. 01, 2023 |  |
Percentage of principal amount redeemable | 101.00% |  |
Violation or event of default, interest payment failure, term | 30 days |  |
Violation or event of default, interest payment failure, maximum excess proceeds on sale of asset | $ 25,000,000.0 |  |
Violation or event of default, interest payment failure, failure to comply with other indenture agreements, term | 60 days |  |
Redemption, Period on or Prior To April 1, 2018 |  |  |
Debt Instrument [Line Items] |  |  |
Redemption price calculation contributor, percentage | 100.00% |  |
Minimum | Redemption, Period on or Prior To April 1, 2018 |  |  |
Debt Instrument [Line Items] |  |  |
Notice period prior to redemption | 30 days |  |
Minimum | Redemption, Period on or After April 1, 2018 |  |  |
Debt Instrument [Line Items] |  |  |
Notice period prior to redemption | 30 days |  |
Maximum | Redemption, Period on or Prior To April 1, 2018 |  |  |
Debt Instrument [Line Items] |  |  |
Notice period prior to redemption | 60 days |  |
Maximum | Redemption, Period on or After April 1, 2018 |  |  |
Debt Instrument [Line Items] |  |  |
Notice period prior to redemption | 60 days |  |

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