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Long-Term Indebtedness (Narrative) (Details) $ / shares in Units, € in Millions |  |  |  |  |  |  | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 13, 2021 USD ($) tradingDay $ / shares | Dec. 19, 2019 USD ($) | Mar. 29, 2019 USD ($) | Dec. 14, 2018 USD ($) | Apr. 27, 2016 USD ($) | Mar. 20, 2015 USD ($) | Jun. 30, 2021 USD ($) $ / shares | Jun. 30, 2020 USD ($) | Jun. 30, 2021 EUR (€) | Dec. 31, 2020 USD ($) | Nov. 11, 2019 USD ($) | Feb. 24, 2014 USD ($)
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |
Long-term indebtedness |  |  |  |  |  |  | $ 941,824,000 |  |  | $ 720,418,000 |  |
Borrowings |  |  |  |  |  |  | 1,007,704,000 |  |  | $ 738,249,000 |  |
Remaining availability under the facilities |  |  |  |  |  |  | 522,600,000 |  |  |  |  |
Proceeds from issuance of convertible notes |  |  |  |  |  |  | $ 460,000,000 | $ 0 |  |  |  |
Percentage of equity interests of controlled foreign corporations (up to) |  |  |  |  |  |  | 65.00% |  |  |  |  |
Level 1 |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |
Convertible debt, fair value |  |  |  |  |  |  | $ 470,400,000 |  |  |  |  |
Term Loan |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |
Debt, face amount |  | $ 300,000,000.0 |  |  |  |  |  |  |  |  |  |
Term Loan | Period one |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |
Debt term |  | 2 years |  |  |  |  |  |  |  |  |  |
Stated interest rate |  | 1.25% |  |  |  |  |  |  |  |  |  |
Term Loan | Period two |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |
Stated interest rate |  | 1.875% |  |  |  |  |  |  |  |  |  |
Convertible Notes |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |
Debt, face amount | $ 460,000,000.0 |  |  |  |  |  |  |  |  |  |  |
Stated interest rate | 1.125% |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of convertible notes | $ 448,200,000 |  |  |  |  |  |  |  |  |  |  |
Debt, conversion ratio | 0.0060369 |  |  |  |  |  |  |  |  |  |  |
Conversion price | $ / shares | $ 165.65 |  |  |  |  |  | $ 165.65 |  |  |  |  |
Redemption price, percentage | 100.00% |  |  |  |  |  |  |  |  |  |  |
Amount of principal held | 25.00% |  |  |  |  |  |  |  |  |  |  |
Convertible Notes | Period one |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |
Threshold trading days | tradingDay | 20 |  |  |  |  |  |  |  |  |  |  |
Threshold consecutive trading days | tradingDay | 30 |  |  |  |  |  |  |  |  |  |  |
Threshold percentage of stock price trigger | 130.00% |  |  |  |  |  |  |  |  |  |  |
Convertible Notes | Period two |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |
Threshold percentage of stock price trigger | 98.00% |  |  |  |  |  |  |  |  |  |  |
JPMorgan Chase Bank And Wells Fargo Bank | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowings under line of credit |  |  |  |  | $ 325,000,000.0 |  |  |  |  |  |  |
Long-term indebtedness |  |  |  | $ 250,000,000.0 |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  | $ 164,500,000 |  | € 138.0 |  |  |
Letter of credit |  |  |  |  |  |  | 2,800,000 |  |  |  |  |
Remaining availability under the facilities |  |  |  |  |  |  | $ 372,600,000 |  |  |  |  |
JPMorgan Chase Bank And Wells Fargo Bank | Line of Credit | LIBOR |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  | 1.00% |  |  |  |  |
Prudential Investment Management Inc | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |
Long-term indebtedness |  |  | $ 50,000,000.0 |  |  | $ 50,000,000.0 |  |  |  |  | $ 200,000,000.0 |
Remaining availability under the facilities |  |  |  |  |  |  |  |  |  |  |  | $ 150,000,000.0
Interest rate during period |  |  | 3.80% |  |  | 3.35% |  |  |  |  |  |
Debt term |  |  | 3 years |  |  | 5 years |  |  |  |  |  |
JPMorgan Chase Bank, N.A., Wells Fargo Bank, N.A., Bank of America, N.A., and 1st Source Bank | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowings under line of credit |  | $ 900,000,000.0 |  | $ 600,000,000.0 |  |  |  |  |  |  |  |
Line of Credit Facility, Additional Maximum Borrowing Capacity Upon Approval |  | $ 300,000,000.0 |  |  |  |  |  |  |  |  |  |
JPMorgan Chase Bank, N.A., Wells Fargo Bank, N.A., Bank of America, N.A., and 1st Source Bank | Line of Credit | Federal Funds Effective Rate |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  | 0.50% |  |  |  |  |  |  |  |
Option One | JPMorgan Chase Bank, N.A., Wells Fargo Bank, N.A., Bank of America, N.A., and 1st Source Bank | Line of Credit | LIBOR |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, additional margin interest rate |  |  |  |  |  |  | 0.375% |  |  |  |  |
Option One | JPMorgan Chase Bank, N.A., Wells Fargo Bank, N.A., Bank of America, N.A., and 1st Source Bank | Line of Credit | LIBOR | Minimum |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, additional margin interest rate |  |  |  |  | 0.00% |  |  |  |  |  |  |
Option One | JPMorgan Chase Bank, N.A., Wells Fargo Bank, N.A., Bank of America, N.A., and 1st Source Bank | Line of Credit | LIBOR | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, additional margin interest rate |  |  |  | 0.625% |  |  |  |  |  |  |  |
Option Two | JPMorgan Chase Bank And Wells Fargo Bank | Line of Credit | LIBOR |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, additional margin interest rate |  |  |  |  |  |  | 1.375% |  |  |  |  |
Option Two | JPMorgan Chase Bank, N.A., Wells Fargo Bank, N.A., Bank of America, N.A., and 1st Source Bank | Line of Credit | LIBOR | Minimum |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, additional margin interest rate |  |  |  | 0.875% |  |  |  |  |  |  |  |
Option Two | JPMorgan Chase Bank, N.A., Wells Fargo Bank, N.A., Bank of America, N.A., and 1st Source Bank | Line of Credit | LIBOR | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, additional margin interest rate |  |  |  | 1.625% |  |  |  |  |  |  |  |

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