Earnings Per Share (Tables)

3 Months Ended

Dec. 31, 2018

Earnings Per Share [Abstract]

Schedule of Basic and Diluted Earnings Per Share

	Three Months Ended December 31,
	2018		2017
Basic Earnings Per Share:
Net Income	$	67.3	$	116.0
Less: Income allocated to participating securities		0.1		0.2
Income Available to Common Shareholders	$	67.2	$	115.8
Weighted Average Shares Outstanding (in millions)		50.6		48.2
Basic Earnings Per Share	$	1.33	$	2.40
Diluted Earnings Per Share:
Net Income	$	67.3	$	116.0
Less: Income allocated to participating securities		0.1		0.2
Income Available to Common Shareholders	$	67.2	$	115.8
Weighted Average Shares Outstanding (in millions)		50.6		48.2
Dilutive Effect of Restricted Stock and Restricted Stock Units (in millions)*		0.2		0.2
Weighted Average Diluted Shares (in millions)		50.8		48.4
Diluted Earnings Per Share	$	1.32	$	2.39
* Calculation excludes certain outstanding shares (shown in millions by period at the     right) attributable to stock units subject to performance or market conditions and     restricted stock, which could have a dilutive effect in the future		0.4		0.3