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Debt - 2017 Credit Agreement (Details) - USD ($) |  |  | 1 Months Ended
--- | --- | --- | ---
Jun. 30, 2017 | Jan. 19, 2017 | Sep. 30, 2013
2017 Term Facility | Goldman Sachs Bank USA |  |  |
Line of Credit Facility [Line Items] |  |  |
Borrowing capacity |  | $ 900,000,000 |
Consent fee percentage | 0.15% |  |
2017 Term Facility | Goldman Sachs Bank USA | Credit Facility |  |  |
Line of Credit Facility [Line Items] |  |  |
Short term debt, principal amount | $ 897,750,000 |  |
Short term debt, unamortized debt issuance costs | 20,707,000 |  |
Short term debt, net carrying value | 877,043,000 |  |
Revolving Facility |  |  |
Line of Credit Facility [Line Items] |  |  |
Borrowing capacity |  | 200,000,000.0 |
Outstanding letters of credit | $ 1,800,000 |  |
Credit Facility |  |  |
Line of Credit Facility [Line Items] |  |  |
Borrowing capacity |  |  | $ 100,000,000
Credit Facility | LIBOR |  |  |
Line of Credit Facility [Line Items] |  |  |
Variable rate basis spread (as a percent) |  |  | 0.0225%
Credit Facility | Minimum |  |  |
Line of Credit Facility [Line Items] |  |  |
Commitment fee on unused balance (as a percent) |  |  | 0.25%
Credit Facility | Maximum |  |  |
Line of Credit Facility [Line Items] |  |  |
Commitment fee on unused balance (as a percent) |  |  | 0.35%
2017 Credit Agreement | 2017 Term Facility | Goldman Sachs Bank USA |  |  |
Line of Credit Facility [Line Items] |  |  |
Borrowing capacity |  | $ 900,000,000 |
Amortization percent per year |  | 1.00% |
Mandatory prepayments, percent of cash proceeds from non-ordinary course sale or other disposition |  | 100.00% |
Mandatory prepayment, covenant two |  | 100.00% |
2017 Credit Agreement | 2017 Term Facility | Goldman Sachs Bank USA | LIBOR |  |  |
Line of Credit Facility [Line Items] |  |  |
Variable rate basis spread (as a percent) |  | 2.75% |
2017 Credit Agreement | 2017 Term Facility | Goldman Sachs Bank USA | Base Rate |  |  |
Line of Credit Facility [Line Items] |  |  |
Variable rate basis spread (as a percent) |  | 1.75% |
2017 Credit Agreement | Revolving Facility | Goldman Sachs Bank USA |  |  |
Line of Credit Facility [Line Items] |  |  |
Borrowing capacity |  | $ 200,000,000 |
2017 Credit Agreement | Revolving Facility | Goldman Sachs Bank USA | LIBOR |  |  |
Line of Credit Facility [Line Items] |  |  |
Variable rate basis spread (as a percent) |  | 2.50% |
2017 Credit Agreement | Revolving Facility | Goldman Sachs Bank USA | Base Rate |  |  |
Line of Credit Facility [Line Items] |  |  |
Variable rate basis spread (as a percent) |  | 1.50% |
2017 Credit Agreement | Revolving Facility | Goldman Sachs Bank USA | Minimum |  |  |
Line of Credit Facility [Line Items] |  |  |
Commitment fee on unused balance (as a percent) |  | 0.25% |
2017 Credit Agreement | Revolving Facility | Goldman Sachs Bank USA | Maximum |  |  |
Line of Credit Facility [Line Items] |  |  |
Commitment fee on unused balance (as a percent) |  | 0.375% |

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- Definition Amount, after accumulated amortization, of debt issuance costs classified as current. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.8) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 + Details
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