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Debt Level 4 (Details) In Thousands, unless otherwise specified	Dec. 31, 2014 USD ($)	Oct. 13, 2014 USD ($)	Oct. 13, 2014 GBP (£)	Mar. 31, 2014 USD ($)
Debt Instrument [Line Items]
Bridge Credit Agreement Commitment Amounts		$ 1,050,000	£ 340,000
Debt Instrument, Face Amount	340,000us-gaap_DebtInstrumentFaceAmount			340,000us-gaap_DebtInstrumentFaceAmount
Line of Credit Facility, Amount Outstanding	270,680			153,480
Long-term Debt	$ 610,680us-gaap_LongTermDebt			$ 493,480us-gaap_LongTermDebt

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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