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Fair Value of Financial Instruments (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
[CarryingReportedAmountFairValueDisclosureMember]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash And Cash Equivalents Fair Value Disclosure	$ 74.1	$ 304.6
Derivative Assets	11.0	6.2
Derivative Financial Instruments Liabilities Fair Value Disclosure	17.6	11.8
Debt Instrument Fair Value	1,473.9	1,480.1
[EstimateOfFairValueFairValueDisclosureMember]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash And Cash Equivalents Fair Value Disclosure	74.1	304.6
Derivative Assets	11.0	6.2
Derivative Financial Instruments Liabilities Fair Value Disclosure	17.6	11.8
Debt Instrument Fair Value	1,613.1	1,703.2
[FairValueInputsLevel1Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash And Cash Equivalents Fair Value Disclosure	74.1	304.6
Derivative Assets	0	0
Derivative Financial Instruments Liabilities Fair Value Disclosure	0	0
Debt Instrument Fair Value	1,541.7	1,625.6
[FairValueInputsLevel2Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash And Cash Equivalents Fair Value Disclosure	0	0
Derivative Assets	11.0	6.2
Derivative Financial Instruments Liabilities Fair Value Disclosure	17.6	11.8
Debt Instrument Fair Value	$ 71.4	$ 77.6

X

- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Company may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months.

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- Definition

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- Definition

Fair values as of the balance sheet date of all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

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- Definition

Derivative instrument obligations meeting the definition of a liability which the Company is a party to as of the balance sheet date.

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