Three Months Ended

Six Months Ended

March 31,

March 31,

(in millions)

2012

2011

2012

2011

Net income — basic and diluted

$

27.4

$

33.0

$

58.7

$

60.1

Weighted average shares outstanding — basic

62.2

62.1

62.1

62.0

Effect of dilutive stock options and unvested time-based restricted stock awards

0.4

—

0.3

—

Weighted average shares outstanding — diluted

62.6

62.1

62.4

62.0