Basis points increase over Treasury Rate upon redemption

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- Definition

Domestic subsidiaries unconditional guarantee

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Price of senior notes, stated as percentage of principal amount.

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- Definition

Redemption price, states as percentage of principal amount

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- Definition

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

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-Publisher FASB

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-Topic 835

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

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Date the debt instrument was issued, in CCYY-MM-DD format.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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Debt and Lease Obligations (Senior Notes) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Nov. 01, 2013	Sep. 11, 2012
2023 Senior notes
Debt Instrument [Line Items]
Debt Instrument, Issuance Date	Nov. 01, 2013
Debt Instrument, Face Amount			$ 300.0
Debt Instrument, Maturity Date	Nov. 15, 2023
Debt Instrument, Interest Rate, Stated Percentage	4.00%	4.00%
Price of senior notes, stated as percentage of principal amount			99.532%
Basis points increase over Treasury Rate upon redemption	25
2022 Senior notes
Debt Instrument [Line Items]
Debt Instrument, Issuance Date	Sep. 11, 2012
Debt Instrument, Face Amount				$ 500.0
Debt Instrument, Maturity Date	Sep. 15, 2022
Debt Instrument, Interest Rate, Stated Percentage	3.50%	3.50%		3.50%
Price of senior notes, stated as percentage of principal amount				99.615%
Basis points increase over Treasury Rate upon redemption	30
Senior Notes
Debt Instrument [Line Items]
Redemption price, states as percentage of principal amount	100.00%
Domestic subsidiaries unconditional guarantee	100.00%