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v3.20.1

Borrowing Arrangements (Details) |  |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jan. 31, 2019 USD ($) | Dec. 17, 2018 USD ($) | Jun. 30, 2017 USD ($) | Jun. 30, 2015 USD ($) | Dec. 31, 2012 USD ($) | Jan. 31, 2020 USD ($) | Dec. 31, 2018 USD ($) | Dec. 16, 2018 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity |  | $ 650,000,000.0 |  |  |  |  |  |
Short-term debt, weighted average interest rate over time |  |  |  |  |  | 4.375% |  |
Senior Notes due 2022 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt issuance costs |  |  |  | $ 3,800,000 |  |  |  |
Term Loan |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  | $ 450,000,000.0 | $ 500,000,000.0 |
Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Proceeds from debt, net of issuance costs |  |  |  | 296,400,000 |  |  |  |
Senior Notes | 2.85 Notes due January 15 2030 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  | $ 500,000,000.0 |  |
Stated interest rate |  |  |  |  |  | 2.85% |  |
Unamortized discount |  |  |  |  |  | $ 1,100,000 |  |
Debt issuance costs |  |  |  |  |  | 4,800,000 |  |
Proceeds from debt, net of issuance costs |  |  |  |  |  | 494,100,000 |  |
Fair value disclosure |  |  |  |  |  | 513,300,000 |  |
Senior Notes | 2017 Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Stated interest rate |  |  | 3.50% |  |  |  |  |
Unamortized discount |  |  | $ 3,100,000 |  |  |  |  |
Debt issuance costs |  |  | 4,900,000 |  |  |  |  |
Proceeds from debt, net of issuance costs |  |  | 492,000,000.0 | 445,600,000 |  |  |  |
Senior Notes | Senior Notes due 2017 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Face amount |  |  | 500,000,000.0 |  |  | 500,000,000.0 |  |
Repayments of debt |  |  | $ 400,000,000.0 |  |  |  |  |
Fair value disclosure |  |  |  |  |  | 535,000,000.0 |  |
Senior Notes | Senior Notes due 2020 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Face amount |  |  |  | $ 450,000,000.0 |  | 450,000,000.0 |  |
Stated interest rate |  |  |  | 3.125% |  |  |  |
Unamortized discount |  |  |  | $ 600,000 |  |  |  |
Fair value disclosure |  |  |  |  |  | 451,500,000 |  |
Senior Notes | Senior Notes due 2025 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Face amount |  |  |  | $ 300,000,000.0 |  | 300,000,000.0 |  |
Stated interest rate |  |  |  | 4.375% |  |  |  |
Fair value disclosure |  |  |  |  |  | 331,900,000 |  |
Senior Notes | 2015 Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Unamortized discount |  |  |  | $ 1,100,000 |  |  |  |
Debt redemption percentage of principle amount (as a percent) |  |  |  | 101.00% |  |  |  |
Senior Notes | Senior Notes due 2022 |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  | 3.60% |  |  |
Debt issuance costs |  |  |  | $ 2,500,000 |  |  |  |
Senior Notes | 2012 Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Face amount |  |  |  |  | $ 350,000,000.0 | 350,000,000.0 |  |
Unamortized discount |  |  |  |  | 500,000 |  |  |
Debt issuance costs |  |  |  |  | 2,800,000 |  |  |
Proceeds from debt, net of issuance costs |  |  |  |  | $ 346,700,000 |  |  |
Fair value disclosure |  |  |  |  |  | 364,000,000.0 |  |
Revolving Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  | $ 400,000,000.0
Revolving Credit Facility | December 17, 2018 Credit Agreement |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, increase limit |  | $ 350,000,000.0 |  |  |  |  |  |
Line of credit facility, outstanding borrowings | $ 0 |  |  |  |  | $ 0 |  |
Revolving Credit Facility | Term Loan |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest rate (as a percentage) | 2.689% |  |  |  |  |  |  |
Fiscal quarter ending January 31, 2019 | Revolving Credit Facility | December 17, 2018 Credit Agreement |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt covenant, interest coverage ratio, minimum |  | 2.50 |  |  |  |  |  |
Fiscal quarter ending April 30, 2019 | Revolving Credit Facility | December 17, 2018 Credit Agreement |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt covenant, interest coverage ratio, minimum |  | 3.00 |  |  |  |  |  |
Fiscal quarter ending July 31, 2019 | Revolving Credit Facility | December 17, 2018 Credit Agreement |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt covenant, leverage ratio, maximum |  | 3.50 |  |  |  |  |  |
Fiscal quarter ending January 31, 2020 | Revolving Credit Facility | December 17, 2018 Credit Agreement |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt covenant, leverage ratio, maximum |  | 3.00 |  |  |  |  |  |
London Interbank Offered Rate (LIBOR) | Term Loan |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 1.125% |  |  |  |  |  |
Minimum | Base Rate | Revolving Credit Facility | December 17, 2018 Credit Agreement |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 0.00% |  |  |  |  |  |
Minimum | Base Rate | Revolving Credit Facility | Term Loan |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 0.00% |  |  |  |  |  |
Minimum | London Interbank Offered Rate (LIBOR) | Revolving Credit Facility | December 17, 2018 Credit Agreement |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 0.90% |  |  |  |  |  |
Minimum | London Interbank Offered Rate (LIBOR) | Revolving Credit Facility | Term Loan |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 0.875% |  |  |  |  |  |
Maximum | Base Rate | Revolving Credit Facility | December 17, 2018 Credit Agreement |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 0.50% |  |  |  |  |  |
Maximum | Base Rate | Revolving Credit Facility | Term Loan |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 0.625% |  |  |  |  |  |
Maximum | London Interbank Offered Rate (LIBOR) | Revolving Credit Facility | December 17, 2018 Credit Agreement |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 1.50% |  |  |  |  |  |
Maximum | London Interbank Offered Rate (LIBOR) | Revolving Credit Facility | Term Loan |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 1.625% |  |  |  |  |  |

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