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COMMON EQUITY - ADOPTION OF ASU 2016-09 (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Changes in retained earnings [Roll Forward]
Balance at December 31, 2016			$ 4,613.9
Net income attributed to common shareholders	$ 199.1	$ 181.4	555.7	$ 527.6
Common stock dividends			(328.3)
Cumulative effect of adoption of ASU 2016-09	15.7		15.7
Balance at June 30, 2017	$ 4,857.0		$ 4,857.0

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- Definition

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

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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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.

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The cumulative amount of the reporting entity's undistributed earnings or deficit.

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