Restructuring reserves at December 31, 2016, as well as activity during the year, consisted of:
 
Balance  
 December 31, 
 2015
 
Provision
 
Payments
 
Balance  
 December 31, 
 2016
 
(in millions)
Personnel-related costs
$
0.3

 
$
8.3

 
$
(5.1
)
 
$
3.5

Facility relocation and closure costs
—

 
4.3

 
(2.7
)
 
1.6

 
$
0.3

 
$
12.6

 
$
(7.8
)
 
$
5.1


Also included in restructuring costs for 2016 were asset write-downs of approximately $0.8 million that did not affect the restructuring reserve liability.

Restructuring reserves at December 31, 2015, as well as activity during the year, consisted of:
 
Balance  
 December 31, 
 2014
 
Provision
 
Payments
 
Balance  
 December 31, 
 2015
 
(in millions)
Personnel-related costs
$
1.1

 
$
3.0

 
$
(3.8
)
 
$
0.3

Facility relocation and closure costs
0.7

 
0.9

 
(1.6
)
 
—

 
$
1.8

 
$
3.9

 
$
(5.4
)
 
$
0.3


The above-mentioned asset write-downs at CPI did not affect the restructuring reserve liability.

Restructuring reserves at December 31, 2014, as well as activity during the year, consisted of:
 
Balance, December 31, 2013
 
Provision
 
Payments
 
Balance  
 December 31, 
 2014
 
(in millions)
Personnel-related costs
$
2.5

 
$
1.3

 
$
(2.7
)
 
$
1.1

Facility relocation and closure costs
0.7

 
1.0

 
(1.0
)
 
0.7

 
$
3.2

 
$
2.3

 
$
(3.7
)
 
$
1.8