EPS (Schedule of Earnings Per Share, Basic and Diluted) (Details) (USD $) In Millions, except Per Share data	3 Months Ended	9 Months Ended
Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
EPS [Abstract]
Income - Basic	$ 67.1	$ 86.4	$ 142.3	$ 218.8
Shares - Basic	115.0	115.8	114.4	115.7
Earnings per share - Basic	$ 0.58	$ 0.75	$ 1.24	$ 1.89
Warrants	0.3	0.3	0.4	0.3
Stock options, performance and restricted shares	0.2	0.2	0.2	0.2
Income - Diluted	$ 67.1	$ 86.4	$ 142.3	$ 218.8
Shares - Diluted	115.5	116.3	115.0	116.2
Earnings per share - Diluted	$ 0.58	$ 0.74	$ 1.24	$ 1.88

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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- Definition

Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of call options and warrants using the treasury stock method.

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- Definition

The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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- Definition

Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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-Glossary Weighted-Average Number of Common Shares Outstanding

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