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v3.20.2

Long Term Debt - Senior Notes - Additional Information (Detail) - USD ($) $ in Millions |  |  |  |  |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 16, 2019 | Nov. 15, 2019 | Sep. 25, 2019 | Jan. 19, 2018 | Jun. 14, 2012 | Oct. 05, 2010 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest expense related to amortization of debt issuance costs |  |  |  |  |  |  | $ 0.3 | $ 0.5 | $ 0.8 | $ 1.2 |
Senior Notes |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Redemption price percentage of principal amount of debt instrument on change of control |  |  |  | 101.00% |  |  |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Repayment of borrowings |  |  |  | $ 239.0 |  |  |  |  |  |  |
4.97% Series A Senior Notes, Due October 5th 2020 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt maturity date |  |  |  |  |  | Oct. 05, 2020 |  |  |  |  |
Long-term debt, aggregate principal amount |  |  |  |  |  | $ 300.0 |  |  |  |  |
Debt interest rate |  |  |  |  |  | 4.97% |  |  |  |  |
Notes issuance date |  |  |  |  |  | Oct. 05, 2010 |  |  |  |  |
Debt Instrument principle including make-whole premium |  |  | $ 308.0 |  |  |  |  |  |  |  |
Debt instrument, redemption percentage |  |  | 100.00% |  |  |  |  |  |  |  |
4.27% Series B Senior Notes, Due June 14th 2022 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt maturity date |  |  |  |  | Jun. 14, 2022 |  |  |  |  |  |
Long-term debt, aggregate principal amount |  |  |  |  | $ 300.0 |  |  |  |  |  |
Debt interest rate |  |  |  |  | 4.27% |  |  |  |  |  |
Notes issuance date |  |  |  |  | Jun. 14, 2012 |  |  |  |  |  |
Debt Instrument principle including make-whole premium | $ 315.0 |  |  |  |  |  |  |  |  |  |
Debt instrument, redemption percentage | 100.00% |  |  |  |  |  |  |  |  |  |
3.95% Senior Notes Due 2028 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt maturity date |  |  |  | Feb. 01, 2028 |  |  |  |  |  |  |
Long-term debt, aggregate principal amount |  |  |  | $ 525.0 |  |  |  |  |  |  |
Debt interest rate |  |  |  | 3.95% |  |  | 3.95% |  | 3.95% |  | 3.95%
Debt instrument, redemption percentage |  |  |  | 100.00% |  |  |  |  |  |  |
Proceeds from borrowings, before offering expenses |  |  |  | $ 521.0 |  |  |  |  |  |  |
Debt payment term |  |  |  |  |  |  |  |  | We pay interest on the 2028 Notes on February 1 and August 1 of each year. |  |
Debt instrument redemption description |  |  |  |  |  |  |  |  | We, at our option, may redeem the Senior Notes in whole or in part, at any time or from time to time at a redemption price equal to 100% of the principal amount of such Senior Notes to be redeemed, plus accrued and unpaid interest, if any, on those Senior Notes to the redemption date, plus a “make-whole” premium. Additionally, commencing on November 1, 2027, in the case of the 2028 Notes, and on August 15, 2029, in the case of the 2029 Notes, we, at our option, may redeem the respective Senior Notes in whole or in part, at a redemption price equal to 100% of the principal amount of the Senior Notes to be redeemed, plus accrued and unpaid interest, if any, on those Senior Notes to the redemption date. |  |
Debt instrument redemption upon the occurrence of change of control, description |  |  |  |  |  |  |  |  | Upon the occurrence of a change of control triggering event, as defined in the indentures, each holder of the Senior Notes may require us to purchase all or a portion of such holder’s Senior Notes at a price equal to 101% of their principal amount, plus accrued and unpaid interest, if any, to, but excluding, the repurchase date. |  |
5.15% Senior Notes Due 2029 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt maturity date |  | Nov. 15, 2029 |  |  |  |  |  |  |  |  |
Long-term debt, aggregate principal amount |  | $ 350.0 |  |  |  |  |  |  |  |  |
Debt interest rate |  | 5.15% |  |  |  |  | 5.15% |  | 5.15% |  | 5.15%
Debt instrument, redemption percentage |  | 100.00% |  |  |  |  |  |  |  |  |
Proceeds from borrowings, before offering expenses |  | $ 347.0 |  |  |  |  |  |  |  |  |
Debt payment term |  |  |  |  |  |  |  |  | We pay interest on the 2029 Notes on May 15 and November 15 of each year. |  |
Debt instrument redemption description |  |  |  |  |  |  |  |  | We, at our option, may redeem the Senior Notes in whole or in part, at any time or from time to time at a redemption price equal to 100% of the principal amount of such Senior Notes to be redeemed, plus accrued and unpaid interest, if any, on those Senior Notes to the redemption date, plus a “make-whole” premium. Additionally, commencing on November 1, 2027, in the case of the 2028 Notes, and on August 15, 2029, in the case of the 2029 Notes, we, at our option, may redeem the respective Senior Notes in whole or in part, at a redemption price equal to 100% of the principal amount of the Senior Notes to be redeemed, plus accrued and unpaid interest, if any, on those Senior Notes to the redemption date. |  |
Term Loan Agreement |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Repayment of borrowings | $ 50.0 |  |  |  |  |  |  |  |  |  |
Debt issuance costs |  |  |  |  |  |  | $ 0.4 |  | $ 0.4 |  |

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