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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement of Other Comprehensive Income [Abstract]
Net income	$ 215.7	$ 217.3	$ 772.0	$ 745.5
Derivatives accounted for as cash flow hedges
Reclassification of gains to net income, net of tax	(0.4)	(0.3)	(1.0)	(0.9)
Defined benefit plans
Amortization of pension and OPEB costs (credits) included in net periodic benefit cost, net of tax	0.3	(0.4)	0.5	0.0
Other comprehensive loss, net of tax	(0.1)	(0.7)	(0.5)	(0.9)
Comprehensive income	215.6	216.6	771.5	744.6
Preferred stock dividends of subsidiary	0.3	0.3	0.9	0.9
Comprehensive income attributed to common shareholders	$ 215.3	$ 216.3	$ 770.6	$ 743.7

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

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