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Significant Accounting Policies Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2012
Accounting Policies [Abstract]  
Gain and losses recognized on the sale and disposal of property
The amount of gains and losses for the years ended December 31 was as follows:
(in millions)
2012
 
2011
 
2010
Gains on the sale of property
$
6.2

 
$
18.7

 
$
4.9

Losses on the sale and disposal of property
(1.3
)
 
(2.7
)
 
(9.9
)
Net gains (losses) on sale and disposal of property
$
4.9

 
$
16.0

 
$
(5.0
)