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Subsequent Events (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		1 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	May 08, 2013 Subsequent Event [Member] Repurchase of Equity [Member]
Subsequent Event [Line Items]
Stock repurchased during period, shares			5.0
Stock repurchased during period, value			$ 80.0
Common stock repurchased under stock repurchase program average purchase price	$ 20.99	$ 21.75	$ 16.16
Stock repurchased and retired during period, Shares	6.2	2.4	5.0
Stock repurchase program, Remaining authorized repurchase amount	$ 438.3		$ 358.3

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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- Definition

Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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