Derivatives (Narrative) (Details) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	$ 14,900,000	$ 4,600,000	$ (9,200,000)
Interest rate swap duration, minimum	5 years
Interest rate swap duration, maximum	10 years
Non-hedge derivatives immaterial	not material	not material	not material
Intercompany Foreign Currency Derivatives, Cash (Paid) Received At Settlement	3,100,000	(1,600,000)	(500,000)
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months	6,600,000
Fair value hedge ineffectiveness	The Company did not realize any ineffectiveness related to fair value hedges during 2014, 2013 and 2012.
Cash flow hedge ineffectiveness	not material
Interest Rate Swap [Member]
Debt Instrument, Face Amount	596,000,000
Forward Interest Rate Swaps [Member]
Derivative Asset, Notional Amount	400,000,000		250,000,000
Commodity Contract [Member]
Derivative Asset, Notional Amount			14,000,000
2.05% Senior Notes Due 2017 [Member]
Debt Instrument, Interest Rate, Stated Percentage	2.05%		2.05%
Debt Instrument, Face Amount	350,000,000.0000		350,000,000.0000
Debt Instrument, Maturity Date	Dec. 01, 2017		Dec. 01, 2017
4.70% senior notes due 2020 [Member]
Debt Instrument, Interest Rate, Stated Percentage	4.70%
Debt Instrument, Face Amount		550,000,000.0000
Debt Instrument, Maturity Date	Aug. 15, 2020
4.70% senior notes due 2020 [Member] \| Interest Rate Swap [Member]
Repayments of Debt	154,000,000
Cash paid, interest rate swap	5,900,000
Debt Instrument, Face Amount	346,000,000.0000
6.25% senior notes due 2018 [Member]
Debt Instrument, Interest Rate, Stated Percentage	6.25%
Debt Instrument, Face Amount	250,000,000.0000
Cash received, interest rate swap	18,700,000
Debt Instrument, Maturity Date	Apr. 15, 2018
4.00% Senior Notes Due 2024 [Member]
Debt Instrument, Interest Rate, Stated Percentage	4.00%
Debt Instrument, Face Amount	500,000,000.0000
Debt Instrument, Maturity Date	Dec. 01, 2024
4.00% Senior Notes Due 2024 [Member] \| Interest Rate Swap [Member]
Debt Instrument, Face Amount	250,000,000.0000
Forward Interest Rate Swaps [Member]
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	$ 0	$ 0	$ (2,500,000)

Cash paid, interest rate swap

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Cash received, interest rate swap

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Intercompany Foreign Currency Derivatives, Cash Received or Paid At Settlement

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Entity discloses that the amount of gain/loss for derivatives not designated as hedges is immaterial.

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The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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A disclosure of an assertion that the amount of cash flow hedge ineffectiveness is immaterial.

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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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-Publisher SEC

-Name Regulation S-X (SX)

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

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Nominal or face amount used to calculate payments on the derivative asset.

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-Glossary Notional Amount

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High end period remaining until maturity for the derivative contract, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

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Low end period remaining until maturity of derivative contract, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Entity discloses that the amount of fair value hedge ineffectiveness is immaterial.

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The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

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