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Network Optimization (Tables)
 12 Months Ended
Dec. 31, 2013
Restructuring and Related Activities [Abstract]  
Schedule of Restructuring and Related Costs [Table Text Block]
A rollforward of our restructuring accrual (which includes both our 2013 Network Optimization and our 2010 restructuring) is as follows:

(in millions)
Employee
Separation
Contract Termination and Other Costs
Total
Balance at December 31, 2010
$
2.6

$
10.9

$
13.5

Payments
(2.6
)
(6.5
)
(9.1
)
Balance at December 31, 2011
$
—

$
4.4

$
4.4

Payments
—

(3.9
)
(3.9
)
Balance at December 31, 2012
$
—

$
0.5

$
0.5

Network optimization charges
1.3

5.0

6.3

Payments
(1.1
)
(4.9
)
(6.0
)
Balance at December 31, 2013
$
0.2

$
0.6

$
0.8