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Debt (Amended Credit Agreement) (Details) | Mar. 23, 2017 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 AUD | Mar. 23, 2017 AUD | Mar. 22, 2017 USD ($) | Mar. 22, 2017 AUD | Dec. 31, 2016 USD ($)
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Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt issuance costs |  | $ 7,612,000 |  |  |  |  | $ 375,000
Term loan |  | 794,000,000 |  |  |  |  | 289,500,000
Revolver |  | 270,559,000 |  |  |  |  | $ 515,000,000
Long-term debt |  | 2,620,269,000 |  |  |  |  |
Additional increase in borrowing capacity ability |  | $ 450,000,000 |  |  |  |  |
Weighted average interest rates on outstanding borrowings |  | 3.90% | 3.90% |  |  |  |
Revolver |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Revolver |  | $ 270,600,000 |  |  |  |  |
Additional Revolver |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Borrowing capacity remaining |  | 559,300,000 |  |  |  |  |
Line of Credit |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term debt |  | 1,152,729,000 |  |  |  |  |
Revolving Credit Facility | Line of Credit | Amended Credit Agreement [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity | $ 900,000,000 |  |  |  |  |  |
Total leverage ratio | 2.50 |  |  | 2.50 |  |  |
Covenant, total leverage ratio, maximum | 6.25 |  |  | 6.25 |  |  |
Senior secured leverage ratio | 3.50 |  |  | 3.50 |  |  |
Interest coverage ratio | 3.00 |  |  | 3.00 |  |  |
Revolving Credit Facility | Line of Credit | Amended Credit Agreement [Member] | LIBOR |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate | 2.25% |  |  | 2.25% |  |  |
Term Loan |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Term loan |  | 794,000,000 |  |  |  |  |
Term Loan | Line of Credit | Amended Credit Agreement [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity | $ 800,000,000 |  |  |  | $ 291,000,000 |  |
Term Loan | Line of Credit | Amended Credit Agreement [Member] | LIBOR |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Basis spread on variable rate | 2.25% |  |  | 2.25% |  |  |
Variable rate, floor | 0.75% |  |  | 0.75% |  |  |
Letter of credit |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term debt |  | 70,100,000 |  |  |  |  |
Letter of credit | Line of Credit | Amended Credit Agreement [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity | AUD |  |  |  | AUD 275,000,000 |  | AUD 225,000,000 |
Debt issuance costs | $ 7,000,000 |  |  |  |  |  |
Letter of credit | Line of Credit | Bank Guarantee And Standby Sub Facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity |  | $ 78,100,000.0 | AUD 100,000,000 |  |  |  |
Accordion | Line of Credit | Amended Credit Agreement [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Accordion feature, increase limit | $ 450,000,000 |  |  |  |  |  |

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- Definition Amount, after accumulated amortization, of debt issuance costs. 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 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + 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(22)) -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 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: 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(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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