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Credit Agreements - Additional Information (Details) - USD ($) |  |  | 3 Months Ended |  |
--- | --- | --- | --- | --- | ---
May 17, 2018 | Mar. 31, 2015 | Dec. 31, 2019 | Sep. 30, 2019 | Apr. 03, 2018
Debt Instrument [Line Items] |  |  |  |  |
Debt, net |  |  | $ 819,200,000 | $ 819,000,000.0 |
Letters of credit outstanding |  |  | $ 63,500,000 |  |
Letter of credit fees percentage on available borrowing capacity, low end of range (as a percent) |  |  | 0.563% |  |
Letter of credit fees percentage on available borrowing capacity, high end of range (as a percent) |  |  | 1.75% |  |
Revolving Credit Facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  | $ 850,000,000
Available borrowing capacity |  |  | $ 786,500,000 |  |
Senior Term Loan |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt, net |  |  | 274,400,000 | 274,400,000 | $ 325,000,000
Quarterly principal installment, at commencement |  |  | 4,100,000 |  |
Payment due at maturity |  |  | $ 264,100,000 |  |
Weighted-average interest rate (as a percent) |  |  | 3.05% |  |
Repayments of Debt | $ 49,200,000 |  |  |  |
Senior Credit Agreement |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest spread in basis points (as a percent) |  |  | 1.25% |  |
Maximum leverage ratio |  |  | 3.75 |  |
Minimum interest coverage ratio |  |  | 2.50 |  |
Debt Instrument, Dividends and Other Distributions Restrictions, Dollar Restriction |  |  | $ 1,460,000,000 |  |
Percentage of consolidated net income of the Company and its subsidiaries accrued on a cumulative basis during the period beginning per the credit agreement and ending on the last day of the fiscal quarter |  |  | 50.00% |  |
Percentage of consolidated net deficit of the Company and its subsidiaries accrued on a cumulative basis during the period beginning per the credit agreement and ending on the last day of the fiscal quarter |  |  | 100.00% |  |
Percentage of aggregate net proceeds received by the Company subsequent to the date defined in the credit agreement as a contribution to its common equity or from the issuance and sale of its Common Stock |  |  | 100.00% |  |
Senior Credit Agreement | Federal Funds Rate |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest spread in basis points (as a percent) |  |  | 0.50% |  |
Senior Credit Agreement | LIBOR |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Interest spread in basis points (as a percent) |  |  | 1.00% |  |
Senior Credit Agreement | Minimum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Revolving credit facility, unused commitment fee rate (as a percent) |  |  | 0.125% |  |
Senior Credit Agreement | Maximum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Revolving credit facility, unused commitment fee rate (as a percent) |  |  | 0.275% |  |
5.375% Senior Notes due March 2025 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt, net |  |  | $ 248,100,000 | 248,000,000.0 |
Debt issued |  | $ 250,000,000.0 |  |  |
Debt instrument interest rate, stated percentage |  | 5.375% | 5.375% |  |
Debt instruments |  |  |  |  |
Debt instrument, fair value |  |  | $ 258,000,000 | 259,000,000 |
4.600% Senior Notes Due May 2028 |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt, net |  |  | $ 296,700,000 | 296,600,000 |
Debt issued | $ 300,000,000.0 |  |  |  |
Debt instrument interest rate, stated percentage | 4.60% |  | 4.60% |  |
Debt instruments |  |  |  |  |
Debt instrument, fair value |  |  | $ 326,000,000 | $ 322,000,000 |

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- Definition Represents the percentage of consolidated net income of the entity and its consolidated subsidiaries for all fiscal quarters ending after the date the company entered into new credit agreement used to determine maximum dividends or other distributions paid during the fiscal year. + References No definition available. + Details
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- Definition Represents the minimum fees for the letter of credit facility, expressed as a percent of the maximum amount available to be drawn against the letter of credit issued and outstanding under the credit facility. + References No definition available. + 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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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=119400593&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 4: 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(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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