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.

+ References+ Details

Amount of cumulative effect of the change in accounting principle or new accounting pronouncement on retained earnings or other components of equity or net assets in the statement of financial position as of the beginning of the earliest period presented.

+ References+ Details

- Definition

Amount of the effect of a change in accounting principle on diluted earnings per share.

+ References

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

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-Name Accounting Standards Codification

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

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Reference 5: http://www.xbrl.org/2003/role/presentationRef

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+ Details

Accounting Updates Outstanding (Details) (USD $)	3 Months Ended								12 Months Ended
Accounting Updates Outstanding (Details) (USD $)	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
New Accounting Pronouncements or Change in Accounting Principle
Earnings Per Share, Diluted	$ (1.11)us-gaap_EarningsPerShareDiluted	$ 0.87us-gaap_EarningsPerShareDiluted	$ 0.94us-gaap_EarningsPerShareDiluted	$ 0.88us-gaap_EarningsPerShareDiluted	$ 0.84us-gaap_EarningsPerShareDiluted	$ 0.78us-gaap_EarningsPerShareDiluted	$ 0.82us-gaap_EarningsPerShareDiluted	$ 0.79us-gaap_EarningsPerShareDiluted	$ 1.61us-gaap_EarningsPerShareDiluted	$ 3.23us-gaap_EarningsPerShareDiluted	$ 3.17us-gaap_EarningsPerShareDiluted
Accounting Standards Update 2014-01 \| Previously Reported
New Accounting Pronouncements or Change in Accounting Principle
Net Income									$ 413,400,000.0	$ 858,100,000.0	$ 894,400,000.0
Earnings Per Share, Diluted									$ 1.61	$ 3.23	$ 3.17
Accounting Standards Update 2014-01 \| Restatement Adjustment
New Accounting Pronouncements or Change in Accounting Principle
After Tax Impact of Adoption of New Accounting Pronouncement on Net Income									(11,300,000.0)	(11,100,000.0)	(6,300,000.0)
After Tax Impact of Adoption of New Accounting Pronouncement on EPS									$ (0.04)	$ (0.04)	$ (0.02)
Effect of Adoption of New Accounting Pronouncement on Retained Earnings	30,000,000				19,000,000				30,000,000	19,000,000	8,000,000
Accounting Standards Update 2014-01 \| Reported After Adjustments
New Accounting Pronouncements or Change in Accounting Principle
Net Income									$ 402,100,000.0	$ 847,000,000	$ 888,100,000.0
Earnings Per Share, Diluted									$ 1.57	$ 3.19	$ 3.15