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Debt - Additional Information (Details) € in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 EUR (€) tranche | Dec. 31, 2015 USD ($)
Debt Instrument [Line Items] |  |  |  |
Debt instrument, covenant terms | In accordance with the terms of the Facility, we are required to maintain a minimum interest coverage ratio of 3.50 (based on the ratio of EBITDA, as defined in the Credit Agreement, to interest expense) and may not exceed a maximum leverage ratio of 3.50 (based on the ratio of total debt to EBITDA) throughout the term of the Facility. |  |  |
Borrowings | $ 930,100,000 | $ 805,600,000 |  |
Term loan |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Face value | € |  |  | € 60 |
Debt instrument, interest rate terms | The loan has two tranches of which the first tranche for €25 million has a rate of Euribor +1.2% and a final maturity date of June 30, 2023, and a second tranche for €35 million has a rate of Euribor +1.25% with a final maturity date of June 30, 2024. The loans are payable in annual installments that began on June 30, 2017, for the first tranche, and beginning on June 30, 2019, for the second. There is a zero percent floor on the Euribor. |  |  |
Number of tranches | tranche |  |  | 2 |
Debt instrument, payment terms | annual |  |  |
Term loan | Euribor |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, floor rate |  |  | 0.00% |
Level 2 | Term loan |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Outstanding amount under loan | $ 61,600,000 |  |  |
Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest coverage ratio required to be maintained | 350.00% |  |  |
3.95% senior unsecured notes due 2027 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Face value |  | $ 400,000,000 |  |
Debt instrument, interest rate | 3.95% | 3.95% |  |
Debt instrument, maturity year |  | 2027 |  |
Increase in senior notes interest rate |  | 0.25% |  |
Effective interest rate | 3.88% |  |  |
3.95% senior unsecured notes due 2027 | Level 2 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fair value of senior notes | $ 390,100,000 |  |  |
3.95% senior unsecured notes due 2027 | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, interest rate |  | 5.95% |  |
3.95% senior unsecured notes due 2027 | Treasury Lock | Interest Lock Agreement |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Percentage of effective interest rate benefit | 0.25% |  |  |
4.7% senior unsecured notes due 2025 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Face value |  |  |  | $ 300,000,000
Debt instrument, interest rate |  |  |  | 4.70%
Debt instrument, maturity year |  |  |  | 2025
Increase in senior notes interest rate |  |  |  | 0.25%
Effective interest rate | 4.84% |  |  |
4.7% senior unsecured notes due 2025 | Level 2 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Fair value of senior notes | $ 306,100,000 |  |  |
4.7% senior unsecured notes due 2025 | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, interest rate |  |  |  | 6.70%
Senior unsecured credit facility- revolving loan due 2021 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument expiration period | 2021-06 |  |  |
Variable interest rate basis | LIBOR + 1.25%. |  |  |
Spread on variable interest rate basis | 1.25% |  |  |
Debt instrument, interest rate terms | The interest rate ranges from LIBOR + 0.875% to a maximum of LIBOR + 1.875%, depending upon the Company’s leverage ratio. |  |  |
Maximum amount available under credit facility to issue letters of credit | $ 40,000,000 |  |  |
Letters of credit outstanding under credit facility | 0 |  |  |
Undrawn availability under credit facility | $ 515,000,000 |  |  |
Weighted average interest rate | 3.17% |  |  |
Senior unsecured credit facility- revolving loan due 2021 | Level 2 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Borrowings | $ 185,000,000 |  |  |
Senior unsecured credit facility- revolving loan due 2021 | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Face value | $ 700,000,000 |  |  |
Variable interest rate basis | LIBOR + 1.875% |  |  |
Spread on variable interest rate basis | 1.875% |  |  |
Senior unsecured credit facility- revolving loan due 2021 | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Variable interest rate basis | LIBOR + 0.875 |  |  |
Spread on variable interest rate basis | 0.875% |  |  |
Tranche one | Term loan |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Face value | € |  |  | € 25 |
Variable interest rate basis | Euribor +1.2% |  |  |
Spread on variable interest rate basis |  |  | 1.20% |
Debt instrument, maturity date | Jun. 30, 2023 |  |  |
Beginning date of first required loan payment | Jun. 30, 2017 |  |  |
Tranche two | Term loan |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Face value | € |  |  | € 35 |
Variable interest rate basis | Euribor +1.25% |  |  |
Spread on variable interest rate basis |  |  | 1.25% |
Debt instrument, maturity date | Jun. 30, 2024 |  |  |
Beginning date of first required loan payment | Jun. 30, 2019 |  |  |

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