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v3.20.4

Debt, Net (Narrative) (Details) |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 17, 2020 USD ($) | Oct. 10, 2018 USD ($) extension | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Oct. 19, 2020 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |
Loss on early extinguishment of debt |  |  | $ (7,306,000) | $ 0 | $ (258,000) |
Revolving Credit Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Weighted average interest rate |  |  | 1.20% |  |  |
Aggregate additional borrowing capacity |  |  | $ 500,000,000.0 |  |  |
Term Loan Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Loan increase |  |  | $ 150,000,000.0 |  |  |
Repayments of term loan |  |  |  |  | $ 100,000,000.0 |
Minimum | Revolving Credit Facility | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Variable rate, spread |  |  | 0.775% |  |  |
Minimum | Term Loan Facility | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Variable rate, spread |  |  | 1.00% |  |  |
Maximum | Revolving Credit Facility | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Variable rate, spread |  |  | 1.45% |  |  |
Maximum | Term Loan Facility | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Variable rate, spread |  |  | 1.65% |  |  |
Revolving Credit Facility | Revolving Credit Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Weighted average borrowings |  |  | $ 204,900,000 | $ 255,600,000 |  |
Weighted average interest rate |  |  | 1.55% | 3.32% |  |
Line of Credit | Revolving Credit Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Current borrowing capacity |  | $ 800,000,000.0 | $ 800,000,000.0 |  |  |
Maximum availability |  | $ 1,250,000,000 |  |  |  |
Number of extensions | extension |  | 2 |  |  |  |
Extension option period |  | 6 months | 6 months |  |  |
Line of credit facility, extension fee |  | 0.075% |  |  |  |
Remaining borrowing capacity |  |  | $ 657,000,000.0 |  |  |
Line of Credit | Revolving Credit Facility | Minimum | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Variable rate, spread |  | 0.775% |  |  |  |
Commitment fee percentage |  | 0.125% |  |  |  |
Line of Credit | Revolving Credit Facility | Maximum | London Interbank Offered Rate (LIBOR) |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Variable rate, spread |  | 1.45% |  |  |  |
Commitment fee percentage |  | 0.30% |  |  |  |
Senior Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Redemption period before maturity date for 100% redemption price |  |  | 3 months |  |  |
Redemption price |  |  | 100.00% |  |  |
Senior Notes | 2.25% Senior Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Loan amount | $ 400,000,000.0 |  | $ 400,000,000 |  |  |
Initial offering price | 99.416% |  |  |  |  |
Proceeds from issuance of debt | $ 395,300,000 |  |  |  |  |
Effective interest rate on debt |  |  | 2.48% |  |  |
Basis point used in determining redemption price prior to maturity | 0.35% |  |  |  |  |
Redemption period before maturity date for 100% redemption price |  |  | 1 month |  |  |
Senior Notes | 3.70% Senior Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Loan amount |  |  |  | $ 300,000,000 |  |
Effective interest rate on debt |  |  |  | 3.85% |  |
Repurchased face amount | $ 122,900,000 |  |  |  |  | $ 177,100,000
Repurchase face amount including accrued interest | $ 126,000,000.0 |  |  |  |  | $ 180,900,000
Loss on early extinguishment of debt |  |  | $ 7,300,000 |  |  |
Senior Notes | 3.60% Senior Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Loan amount |  |  | $ 350,000,000 |  |  |
Effective interest rate on debt |  |  | 3.70% |  |  |
Senior Notes | 3.60% Senior Notes | Adjusted Treasury |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis point used in determining redemption price prior to maturity |  |  | 0.30% |  |  |
Senior Notes | 5.250% Senior Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Loan amount |  |  | $ 250,000,000 |  |  |
Effective interest rate on debt |  |  | 5.49% |  |  |
Senior Notes | 5.250% Senior Notes | Adjusted Treasury |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis point used in determining redemption price prior to maturity |  |  | 0.40% |  |  |
Senior Notes | 5.0% Senior Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Loan amount |  |  | $ 300,000,000 |  |  |
Effective interest rate on debt |  |  | 5.15% |  |  |
Senior Notes | 5.0% Senior Notes | Adjusted Treasury |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis point used in determining redemption price prior to maturity |  |  | 0.45% |  |  |

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