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Restructuring and Acquisition Charges (Tables)
 12 Months Ended
Dec. 31, 2018
Restructuring and Related Activities [Abstract]  
Restructuring Charges and Related Payment Activity
The following table shows the restructuring and acquisition accrual activity and related payments, which are exclusive of the adjustments individually noted above.
($ in millions)
Severance & Employment-Related
Lease
Exit
Other Restructuring and
Acquisition
Costs
Total
December 31, 2015
$
2.7

5.7

0.2

 
$
8.6

Accruals
28.0

0.3

20.2

 
48.5

Payments made
(11.0
)
(0.5
)
(14.6
)
 
(26.1
)
December 31, 2016
19.7

5.5

5.8

 
31.0

Accruals
21.6

1.3

5.9

 
28.8

Payments made
(27.1
)
(1.1
)
(10.3
)
 
(38.5
)
December 31, 2017
14.2

5.7

1.4

 
21.3

Accruals
25.5

0.7

5.2

 
31.4

Payments made
(25.7
)
(5.8
)
(6.1
)
 
(37.6
)
December 31, 2018
$
14.0

0.6

0.5

 
$
15.1