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Significant Accounting Policies Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2017
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)
2017
 
2016
 
2015
Gains on the sale of property
$
0.7

 
$
0.4

 
$
1.1

Losses on the sale and disposal of property
(2.3
)
 
(0.5
)
 
(2.0
)
Net losses on sale and disposal of property
$
(1.6
)
 
$
(0.1
)
 
$
(0.9
)