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Network Optimization Network Optimization (Tables)
 9 Months Ended
Sep. 30, 2013
Restructuring [Abstract]  
Schedule of Restructuring and Related Costs
A rollforward of the accrual is as follows:

(in millions)
Employee
Separation
Contract Termination and Other Costs
Total
Balance at December 31, 2012
$
—

$
0.5

$
0.5

Network optimization charges
1.3

5.0

6.3

Payments
(0.9
)
(4.6
)
(5.5
)
Balance at September 30, 2013
$
0.4

$
0.9

$
1.3