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Defined Benefit Plans (Tables)
 6 Months Ended
Mar. 31, 2014
Compensation and Retirement Disclosure [Abstract]  
Components of Consolidated Net Periodic Benefit and Deferred Compensation Benefit Costs and Contributions Made
he components of consolidated net periodic benefit and deferred compensation benefit costs and contributions made are as follows:
 
Three months ended
 
Six months ended
 
March 31, 2014
 
March 31, 2013
 
March 31, 2014
 
March 31, 2013
Service cost
$
0.8

 
$
0.9

 
$
2.0

 
$
1.7

Interest cost
2.6

 
2.7

 
6.0

 
5.3

Expected return on assets
(2.4
)
 
(2.4
)
 
(6.0
)
 
(4.9
)
Recognized net actuarial loss
0.4

 
0.6

 
0.8

 
1.1

Employee contributions
—

 
(0.1
)
 
—

 
(0.1
)
   Net periodic benefit expense
$
1.4

 
$
1.7

 
$
2.8

 
$
3.1

Contributions made during period
$
2.2

 
$
1.2

 
$
5.6

 
$
1.9