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Common Equity - Calculation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2024	Sep. 30, 2023
Basic earnings per common share
Net income available to common shareholders	$ 30.6	$ 35.3	$ 18.5	$ 35.6	$ 77.5	$ 98.0	$ 84.4	$ 211.1
Weighted average common shares outstanding	175.2			176.9			175.6	177.7
Diluted earnings per common share
Dilutive effect of share-based awards and options outstanding	0.7			0.9			0.5	0.8
Weighted average diluted shares outstanding	175.9			177.7			176.1	178.5
Basic earnings per share	$ 0.17			$ 0.20			$ 0.48	$ 1.19
Diluted earnings per share	$ 0.17			$ 0.20			$ 0.48	$ 1.18

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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