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LONG-TERM DEBT: (Details) $ in Millions | Apr. 20, 2015 USD ($) item | Jun. 30, 2015
--- | --- | ---
LONG-TERM DEBT: |  |
Principal amount | $ 2,000.0 |
Number of tranches | item | 2 |
Underwriters discount | $ 20.2 |
Debt issuance cost | 9.6 |
3.875% Senior unsecured notes due 2025 |  |
LONG-TERM DEBT: |  |
Principal amount | $ 500.0 |
Interest rate (as a percent) | 3.875% | 3.875%
5.875% Senior unsecured notes due 2045 |  |
LONG-TERM DEBT: |  |
Principal amount | $ 1,500.0 |
Interest rate (as a percent) | 5.875% | 5.875%

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