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Earnings Per Share and Common Stock (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Earnings Per Share - Basic [Abstract]
Net Income	$ 70.5	$ 51.0
Average Common Shares	51.6	51.2
Earnings Per Share	$ 1.37	$ 1.00
Earnings Per Share - Diluted [Abstract]
Net Income	$ 70.5	$ 51.0
Average Common Shares	51.7	51.4
Earnings Per Share	$ 1.37	$ 0.99
Dilutive Securities (Shares)	0.1	0.2

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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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