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Restructuring and Acquisition Charges (Tables)
 12 Months Ended
Dec. 31, 2019
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, 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

Accruals
31.1

11.1

85.8

 
128.0

Payments made
(20.8
)
(3.3
)
(82.5
)
 
(106.6
)
December 31, 2019
$
24.3

8.4

3.8

 
$
36.5