Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2012

Earnings Per Share [Abstract]

Reconciliation Of Net Earnings To Net Earnings Attributable To Common Shares Used In Basic And Diluted Calculation

	Three Months Ended		Six Months Ended
	June 30,		June 30,
	2012	2011	2012	2011
Earnings	$41.8	$37.9	$60.0	$51.4
Earnings allocated to participating non-vested
share awards	(0.3)	(0.3)	(0.4)	(0.4)
Earnings attributable to common shares	$41.5	$37.6	$59.6	$51.0

Reconciliation Of Basic Shares Outstanding To Diluted Shares Outstanding

	Three Months Ended		Six Months Ended
	June 30,		June 30,
	2012	2011	2012	2011
Basic shares outstanding	58.8	58.3	58.7	58.2
Dilutive effect of stock option awards	0.6	0.6	0.6	0.6
Diluted shares outstanding	59.4	58.9	59.3	58.8