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Restructuring and Acquisition-Related Costs Restructuring and Acquisition-Related Costs (Tables)
 12 Months Ended
Dec. 31, 2017
Restructuring and Related Activities [Abstract]  
Restructuring and Related Costs [Table Text Block]
A summary of this activity for the years 2017 and 2016 is shown below:
 
Severance Charges
 
Implementation Costs
 
Asset Impairment Charges
 
Total
 
(in millions)
Accrual at January 1, 2016
$
—

 
$
—

 
$
—

 
$
—

Charges
0.6

 
10.2

 
4.5

 
15.3

Cash utilization
—

 
(1.0
)
 
—

 
(1.0
)
Non-cash utilization
—

 
—

 
(4.5
)
 
(4.5
)
Accrual at December 31, 2016
0.6

 
9.2

 
—

 
9.8

Charges
2.0

 
13.9

 
1.5

 
17.4

Cash utilization
(2.3
)
 
(23.1
)
 
—

 
(25.4
)
Non-cash utilization
—

 
—

 
(1.5
)
 
(1.5
)
Accrual at December 31, 2017
$
0.3

 
$
—

 
$
—

 
$
0.3
Business Combination, Separately Recognized Transactions [Table Text Block]
The following table represents a summary of acquisition-related charges incurred in 2017 related to our acquisitions of USM Mexico and MPG:
 
Acquisition-Related Costs
 
Severance Charges
 
Integration Expenses
 
Total
 
(in millions)
Charges
$
40.7

 
$
7.2

 
$
45.4

 
$
93.3

 
 
 
 
 
 
 
 
Total restructuring and acquisition-related charges in 2017
 
 
$
110.7