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Restructuring (Benefits) Charges (Tables)
 6 Months Ended
Jun. 30, 2018
Restructuring and Related Activities [Abstract]  
Schedule of restructuring liabilities
The following table provides a summary of changes in the restructuring liabilities (in millions):
 
December 31,
2017
 
Benefits
 
Cash
Payments
 

Other
 
June 30,
2018
Severance
$
17.7

 
$
(1.1
)
 
$
(15.6
)
 
$
0.1

 
$
1.1

Contract terminations and other
2.3

 
(1.0
)
 
(1.3
)
 
—

 
—

Total
$
20.0

 
$
(2.1
)
 
$
(16.9
)
 
$
0.1

 
$
1.1