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Long-Term Indebtedness (Narrative) (Details) $ / shares in Units, € in Millions |  |  |  |  |  |  | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 07, 2021 USD ($) | May 13, 2021 USD ($) tradingDay $ / shares | Dec. 19, 2019 USD ($) | Mar. 29, 2019 USD ($) | Apr. 27, 2016 USD ($) | Mar. 20, 2015 USD ($) | Dec. 31, 2021 USD ($) $ / shares | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2021 EUR (€) | Sep. 07, 2021 USD ($) | Nov. 11, 2019 USD ($) | Dec. 14, 2018 USD ($) | Mar. 30, 2017 USD ($) | Feb. 24, 2014 USD ($)
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term indebtedness |  |  |  |  |  |  | $ 1,231,959,000 | $ 720,418,000 |  |  |  |  |  |  |
Long-term debt, net |  |  |  |  |  |  | 1,302,962,000 | 738,249,000 |  |  |  |  |  |  |
Proceeds from issuance of convertible notes |  |  |  |  |  |  | 460,000,000 | 0 | $ 0 |  |  |  |  |  |
Level 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Debt, Fair Value Disclosures |  |  |  |  |  |  | $ 506,000,000 |  |  |  |  |  |  |  |
Term Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount | $ 400,000,000 |  | $ 300,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Term Loan | Period One |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument term (in years) |  |  | 2 years |  |  |  |  |  |  |  |  |  |  |  |
Term Loan | Period Two |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument term (in years) |  |  | 2 years |  |  |  |  |  |  |  |  |  |  |  |
Term Loan | First Eight Quarters |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed | 1.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term Loan | Next Eight Quarters |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed | 1.875% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Term Loan | Thereafter |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed | 2.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount |  | $ 460,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Stated rate |  | 1.125% |  |  |  |  |  |  |  |  |  |  |  |  |
Debt conversion ratio |  | 0.0060369 |  |  |  |  | 0.0060553 |  |  |  |  |  |  |  |
Conversion price | $ / shares |  | $ 165.65 |  |  |  |  | $ 165.65 |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of convertible notes |  | $ 447,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Redemption, Amount of Principal Held, Percent |  | 25.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Debt | Period One |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Threshold Trading Days | tradingDay |  | 20 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Threshold Consecutive Trading Days | tradingDay |  | 30 |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger |  | 130.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible Debt | Period Two |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger |  | 98.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  |  |  | 65.00% |  |  | 65.00% |  |  |  |  |
Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining availability under the facilities |  |  |  |  |  |  | $ 318,300,000 |  |  |  |  |  |  |  |
JPMorgan Chase Bank And Wells Fargo Bank | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowings under line of credit |  |  |  |  | $ 325,000,000 |  |  |  |  |  |  |  |  |  |
Long-term debt, net |  |  |  |  |  |  | 160,100,000 |  |  | € 138.0 |  |  |  |  |
Letter of credit |  |  |  |  |  |  | 27,800,000 | $ 2,900,000 |  |  |  |  |  |  |
Remaining availability under the facilities |  |  |  |  |  |  | $ 168,300,000 |  |  |  |  |  |  |  |
Commitment fee percentage |  |  |  |  |  |  | 0.20% |  |  |  |  |  |  |  |
JPMorgan Chase Bank And Wells Fargo Bank | Line of Credit | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment fee percentage |  |  |  |  |  |  | 0.15% |  |  |  |  |  |  |  |
JPMorgan Chase Bank And Wells Fargo Bank | Line of Credit | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment fee percentage |  |  |  |  |  |  | 0.225% |  |  |  |  |  |  |  |
JPMorgan Chase Bank And Wells Fargo Bank | Line of Credit | Prime Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  | 1.00% |  |  |  |  |  |  |  |
JPMorgan Chase Bank And Wells Fargo Bank | Letter of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowings under line of credit |  |  |  |  | $ 50,000,000 |  |  |  |  |  |  |  |  |  |
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 | $ 1,000,000,000 |  | $ 900,000,000 |  |  |  |  |  |  |  |  |  | $ 600,000,000 |  |
Additional maximum borrowing capacity upon approval |  |  | $ 300,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Prudential Investment Management Inc | Line of Credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term indebtedness |  |  |  | $ 50,000,000 |  | $ 50,000,000 |  |  |  |  | $ 400,000,000 | $ 200,000,000 | $ 250,000,000 |  |
Remaining availability under the facilities |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 150,000,000 | $ 150,000,000
Weighted average interest rate |  |  |  | 3.80% |  | 3.35% |  |  |  |  |  |  |  |  |
Debt instrument term (in years) |  |  |  | 3 years |  | 5 years |  |  |  |  |  |  |  |  |
Prudential Investment Management Inc | Line of Credit | New Term Loan, Amendment No. 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term indebtedness | $ 400,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 additional margin interest rate |  |  |  |  | 0.00% |  | 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 | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt additional margin interest rate |  |  |  |  |  |  | 0.625% |  |  |  |  |  |  |  |
Option One | 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  | 0.50% |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  | 1.625% |  |  |  |  |  |  |  |
Option Three | 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  | 1.4076% |  |  |  |  |  |  |  |
Option Three | 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  | 0.9076% |  |  |  |  |  |  |  |
Option Three | 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  |  | 1.6576% |  |  |  |  |  |  |  |

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