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Debt - Maturities of Long-Term Debt (Details)	Sep. 30, 2018 USD ($)
Debt Instrument [Line Items]
2019	$ 0
2020	314,000,000
2021	0
2022	700,000,000
2023	0
Thereafter	330,000,000
Long-term Debt, Gross	1,344,000,000
Senior Notes | 5.375% Notes
Debt Instrument [Line Items]
2019	0
2020	0
2021	0
2022	700,000,000
2023	0
Thereafter	0
Long-term Debt, Gross	700,000,000
Senior Notes | 4.875% Notes
Debt Instrument [Line Items]
2019	0
2020	0
2021	0
2022	0
2023	0
Thereafter	330,000,000
Long-term Debt, Gross	330,000,000
Convertible Notes | 1.125% Notes
Debt Instrument [Line Items]
2019	0
2020	314,000,000
2021	0
2022	0
2023	0
Thereafter	0
Long-term Debt, Gross	$ 314,000,000

X

- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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