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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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Contractual interest rate for funds borrowed, under the debt agreement.

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Cash paid for expenses incurred during underwriting activities (the process to review insurance applications, evaluate risks, accept or reject applications, and determine the premiums to be charged) for insurance companies.

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