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Restructuring and Acquisition Charges (Tables)
 12 Months Ended
Dec. 31, 2016
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
Retention
Bonuses
Lease
Exit
Other
Acquisition
Costs
Total
December 31, 2013
$
3.8

0.4

5.9

0.4

10.5

Accruals
5.2

—

3.2

3.5

11.9

Payments made
(6.0
)
(0.4
)
(4.9
)
(3.5
)
(14.8
)
December 31, 2014
3.0

—

4.2

0.4

7.6

Accruals
1.7

—

1.6

15.6

18.9

Payments made
(2.0
)
—

(0.1
)
(15.8
)
(17.9
)
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