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Fair Value Disclosure (Details) (Fair Value, Measurements, Recurring [Member], USD $)
In Millions, unless otherwise specified

Dec. 31, 2012

Dec. 31, 2011

Available for sale equity securities

$ 3.3

$ 2.9

Designated as Hedging Instrument [Member]

Interest rate derivatives

10.2

^[1]

15.3

^[1]

Liabilities

Interest rate derivatives

1.0

^[1]

2.1

^[1]

Not Designated as Hedging Instrument [Member]

Foreign exchange rate derivatives

2.1

^[2]

Liabilities

Interest rate derivatives

0.3

^[2]

0.3

^[2]

Foreign exchange rate derivatives

2.1

^[2]

Fair Value, Inputs, Level 1 [Member]

Available for sale equity securities

3.3

2.9

Fair Value, Inputs, Level 1 [Member] | Designated as Hedging Instrument [Member]

Interest rate derivatives

0

^[1]

0

^[1]

Liabilities

Interest rate derivatives

0

^[1]

0

^[1]

Fair Value, Inputs, Level 1 [Member] | Not Designated as Hedging Instrument [Member]

Foreign exchange rate derivatives

0

^[2]

Liabilities

Interest rate derivatives

0

^[2]

0

^[2]

Foreign exchange rate derivatives

0

^[2]

Fair Value, Inputs, Level 2 [Member]

Available for sale equity securities

0

0

Fair Value, Inputs, Level 2 [Member] | Designated as Hedging Instrument [Member]

Interest rate derivatives

10.2

^[1]

15.3

^[1]

Liabilities

Interest rate derivatives

1.0

^[1]

2.1

^[1]

Fair Value, Inputs, Level 2 [Member] | Not Designated as Hedging Instrument [Member]

Foreign exchange rate derivatives

2.1

^[2]

Liabilities

Interest rate derivatives

0.3

^[2]

0.3

^[2]

Foreign exchange rate derivatives

2.1

^[2]

Fair Value, Inputs, Level 3 [Member]

Available for sale equity securities

0

0

Fair Value, Inputs, Level 3 [Member] | Designated as Hedging Instrument [Member]

Interest rate derivatives

0

^[1]

0

^[1]

Liabilities

Interest rate derivatives

0

^[1]

0

^[1]

Fair Value, Inputs, Level 3 [Member] | Not Designated as Hedging Instrument [Member]

Foreign exchange rate derivatives

0

^[2]

Liabilities

Interest rate derivatives

0

^[2]

0

^[2]

Foreign exchange rate derivatives

$ 0

^[2]

[1]	Designated as hedges
[2]	Not designated as hedges

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 represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

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