Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.

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-Name Regulation S-X (SX)

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The per share amount of a dividend declared, but not paid, as of the financial reporting date.

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

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Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.

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-Name Accounting Standards Codification

-Glossary Financing Activities

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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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-Publisher SEC

-Name Regulation S-X (SX)

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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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-Publisher SEC

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The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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No definition available.

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Period which shares may be purchased under a stock repurchase plan authorized by an entity's Board of Directors, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Shareholders' Equity (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	1 Months Ended		3 Months Ended		1 Months Ended
	Mar. 31, 2015	Apr. 30, 2014	Mar. 31, 2015	Mar. 31, 2014	Apr. 30, 2015	Jan. 31, 2015	Sep. 30, 2014	Jun. 30, 2014
Quarterly dividend approved by Board prior to payment, per share (in dollars per share)							$ 0.125us-gaap_DividendsPayableAmountPerShare	$ 0.10us-gaap_DividendsPayableAmountPerShare
Dividends declared			$ 38.8us-gaap_DividendsCommonStockCash	$ 31.4us-gaap_DividendsCommonStockCash
Dividends paid	38.8us-gaap_PaymentsOfDividendsCommonStock	31.4us-gaap_PaymentsOfDividendsCommonStock	77.5us-gaap_PaymentsOfDividendsCommonStock
2015 Stock Repurchase Program
Number of shares authorized to be repurchased under the current open-market stock repurchase program					8.3	10.0
Repurchase of stock program, period						2 years
Number of shares repurchased under the current open-market stock repurchase program			1.1		0.6
Payments for shares repurchased under the current open-market stock repurchase program (in dollars)			$ 62.2		$ 34.8