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Deferred Revenue and Advances From Customers (Tables)
9 Months Ended
Sep. 30, 2013
Deferred Revenue and Credits, Current [Abstract]  
Schedule of Deferred Revenue and Advances from Customers
 
September 30,
2013
 
December 31,
2012
 
(millions)
Deferred revenue
$
163.7

 
$
123.1

Advances from customers

 
2.4

 
$
163.7

 
$
125.5

 
 
 
 
Deferred costs associated with deferred revenue
$
136.6

 
$
116.8