Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2018

Earnings Per Share [Abstract]

Reconciliation of Basic and Diluted Earnings per Share

A reconciliation of net income for diluted income per share is set forth below (in millions):

	Three months ended March 31,
	2018			2017
Net income (loss)	$	(112.3	)	$	10.3
Income allocated to non-vested share awards	—			(0.9		)
Net income - adjusted for income allocated to non-vested share awards	$	(112.3	)	$	9.4

Schedule of Weighted Average Number of Shares [Table Text Block]

A reconciliation of shares for basic and diluted income per share is set forth below (in millions):

	Three months ended March 31,
	2018	2017
Average common shares outstanding	126.5	125.7
Effect of dilutive securities - share-based compensation	—	1.7
Average shares for diluted computations	126.5	127.4

Antidilutive Securities Excluded From Earnings per Share

Anti-dilutive shares, which could potentially dilute earnings per share in the future, are set forth below (in millions):

	Three months ended March 31,
	2018	2017
Share options and appreciation rights	1.5	1.5
Nonvested restricted shares and restricted share units	4.6	1.4
Total potentially dilutive shares	6.1	2.9