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Subsequent Event (Details) - Senior Secured Credit Facility - USD ($) | Oct. 10, 2018 | Nov. 20, 2017 | Dec. 18, 2015
--- | --- | --- | ---
Line of Credit Facility [Line Items] |  |  |
Borrowing capacity |  |  | $ 1,810,000,000
Cross default provisions with debt instruments exceeding this amount |  | $ 100,000,000.0 |
Subsequent Event |  |  |
Line of Credit Facility [Line Items] |  |  |
Borrowing capacity | $ 2,590,000,000 |  |
Amount of option to increase credit facility | 400,000,000.0 |  |
Cross default provisions with debt instruments exceeding this amount | 150,000,000.0 |  |
Revolving Credit Facility | Subsequent Event |  |  |
Line of Credit Facility [Line Items] |  |  |
Increase in maximum borrowing capacity | 175,000,000.0 |  |
Borrowing capacity | 1,990,000,000 |  |
Term Loan | Subsequent Event |  |  |
Line of Credit Facility [Line Items] |  |  |
Borrowing capacity | 600,000,000.0 |  |
Quarterly amortization payment | $ 7,500,000 |  |
Term Loan | Eurocurrency Rate | Minimum | Subsequent Event |  |  |
Line of Credit Facility [Line Items] |  |  |
Additional amount over rate (up to) | 1.125% |  |
Term Loan | Eurocurrency Rate | Maximum | Subsequent Event |  |  |
Line of Credit Facility [Line Items] |  |  |
Additional amount over rate (up to) | 1.875% |  |
Term Loan | Base Rate | Minimum | Subsequent Event |  |  |
Line of Credit Facility [Line Items] |  |  |
Additional amount over rate (up to) | 0.125% |  |
Term Loan | Base Rate | Maximum | Subsequent Event |  |  |
Line of Credit Facility [Line Items] |  |  |
Additional amount over rate (up to) | 1.00% |  |
Swing Lines Loan | Australian Dollars |  |  |
Line of Credit Facility [Line Items] |  |  |
Borrowing capacity |  |  | $ 30,000,000.0
Swing Lines Loan | Australian Dollars | Subsequent Event |  |  |
Line of Credit Facility [Line Items] |  |  |
Borrowing capacity | $ 50,000,000.0 |  |

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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