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Significant Accounting Policies Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2016
Accounting Policies [Abstract]  
Net Gains (Losses) on Sale and Disposal of Property [Table Text Block]
The amount of gains and losses for the years ended December 31 were as follows:
(in millions)
2016
 
2015
 
2014
Gains on the sale of property
$
0.5

 
$
1.1

 
$
1.8

Losses on the sale and disposal of property
(0.6
)
 
(2.0
)
 
(0.5
)
Net gains (losses) on sale and disposal of property
$
(0.1
)
 
$
(0.9
)
 
$
1.3