Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

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Face (par) amount of debt instrument at time of issuance.

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

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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The amount of debt discount (net of debt premium) that was originally recognized at the issuance of the instrument that has yet to be amortized.

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Weighted average interest rate of debt outstanding.

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Amount as of the balance sheet date of the unamortized adjustment to the carrying value of an interest-bearing hedged item made under an effective interest rate fair value hedge that is amortized upon discontinuation of the interest rate fair value hedge.

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Gross amount of debt extinguished.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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Including the current and noncurrent portions, carrying value as of the balance sheet date of long-term unsecured obligations issued by corporations and other borrowers to investors (with maturities initially due after one year or beyond the operating cycle if longer).

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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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Amount of long-term debt, after unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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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 in the next 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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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 in 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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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 in the fourth 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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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 in the third 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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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 in the second 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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Carrying amount of long-term debt, net of unamortized discount or premium, excluding amounts to be repaid within one year or the normal operating cycle, if longer (current maturities). Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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Debt (Details) (USD $)	3 Months Ended	12 Months Ended
Debt (Details) (USD $)	Mar. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Oct. 31, 2014
Debt Instrument [Line Items]
Principal amount		$ 3,226,943,000us-gaap_LongTermDebt	$ 3,310,793,000us-gaap_LongTermDebt
Less: unamortized discount		6,653,000	5,158,000
Plus: unamortized interest rate swap proceeds		31,716,000	40,660,000
Total debt		3,252,006,000us-gaap_DebtInstrumentCarryingAmount	3,346,295,000us-gaap_DebtInstrumentCarryingAmount
Less: current portion long-term debt		324,879,000us-gaap_LongTermDebtCurrent	0us-gaap_LongTermDebtCurrent
Long-term debt		2,927,127,000us-gaap_LongTermDebtNoncurrent	3,346,295,000us-gaap_LongTermDebtNoncurrent
Aggregate notes tendered	500,000,000us-gaap_ExtinguishmentOfDebtAmount
Expenses	62,000,000
Proceeds from issuance of long-term debt		508,525,000	411,613,000	340,000,000
Repayments of loans		599,850,000us-gaap_RepaymentsOfLongTermDebt	1,079,207,000us-gaap_RepaymentsOfLongTermDebt	550,000,000us-gaap_RepaymentsOfLongTermDebt
Commercial paper borrowings outstanding		0	0
Credit facility		1,000,000,000
Maturities of Long-term Debt [Abstract]
2016		450,914,000
2015		324,879,000
2017		385,109,000
2018		600,000,000
2019		300,000,000
Thereafter		1,166,041,000
LIBOR
Debt Instrument [Line Items]
Variable interest rate		2.25%
Prime Rate
Debt Instrument [Line Items]
Variable interest rate		1.25%
Notes due 2015
Debt Instrument [Line Items]
Interest rate		5.00%
Debt face amount		274,879,000	274,879,000
Notes due 2016
Debt Instrument [Line Items]
Interest rate		4.75%
Debt face amount		370,914,000	370,914,000
Notes due 2017
Debt Instrument [Line Items]
Interest rate	5.75%	5.75%
Debt face amount		385,109,000	500,000,000
Notes due March 2018
Debt Instrument [Line Items]
Interest rate		5.60%
Debt face amount		250,000,000	250,000,000
Notes due May 2018
Debt Instrument [Line Items]
Interest rate		4.75%
Debt face amount		350,000,000	350,000,000
Notes due 2019
Debt Instrument [Line Items]
Interest rate		6.25%
Debt face amount		300,000,000	300,000,000
Notes due 2022
Debt Instrument [Line Items]
Interest rate		5.25%
Debt face amount		110,000,000	110,000,000
Notes due 2024
Debt Instrument [Line Items]
Interest rate	4.625%	4.625%
Debt face amount	500,000,000	500,000,000	0
Notes term	10 years
Redemption price percentage	100.00%
Proceeds from issuance of long-term debt	493,000,000
State of CT DECD loan due 2024
Debt Instrument [Line Items]
Interest rate		2.00%
Debt face amount		16,000,000	0
Development Loan
Debt Instrument [Line Items]
Debt face amount					15,000,000
Jobs-Training Grant
Debt Instrument [Line Items]
Debt face amount					1,000,000
Notes due 2037
Debt Instrument [Line Items]
Interest rate	5.25%	5.25%
Debt face amount		115,041,000	500,000,000
Notes due 2043
Debt Instrument [Line Items]
Interest rate		6.70%
Debt face amount		425,000,000	425,000,000
Term loans
Debt Instrument [Line Items]
Debt face amount		130,000,000	230,000,000
Repayments of loans		$ 100,000,000
Weighted average interest rate		2.48%