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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2019
Accounting Policies [Abstract]  
Schedule of Estimated Useful Lives of Depreciable Assets The provision for depreciation has been computed principally by the straight-line method based on the estimated useful lives of the depreciable assets as follows:
Category
  
Useful Life
Buildings
  
30 years
Leased assets and leasehold improvements
  
Amortized over the lesser of the economic life of the asset or the term of the lease
Machinery and equipment
  
3 – 10 years

The classes of property, plant and equipment as of December 31 are summarized as follows ($ in millions):
 
2019
 
2018
Land and improvements
$
63.4

 
$
63.1

Buildings and leasehold improvements
363.8

 
343.6

Machinery and equipment
931.0

 
1,059.2

Gross property, plant and equipment
1,358.2

 
1,465.9

Less: accumulated depreciation
(838.7
)
 
(889.8
)
Property, plant and equipment, net
$
519.5

 
$
576.1
Schedule of Changes in Accumulated Other Comprehensive Income (Loss) by Component
The changes in AOCI by component are summarized below ($ in millions):
 
Foreign
currency
translation
adjustments
 
Pension & post-
retirement
plan benefit
adjustments (b)
 
Total
Balance, January 1, 2017
$
(72.6
)
 
$
(73.2
)
 
$
(145.8
)
Other comprehensive income (loss) before reclassifications:
 
 
 
 
 
Increase (decrease)
136.6

 
(3.5
)
 
133.1

Income tax impact
—

 
0.9

 
0.9

Other comprehensive income (loss) before reclassifications, net of income taxes
136.6

 
(2.6
)
 
134.0

Amounts reclassified from accumulated other comprehensive income (loss):
 
 
 
 
 
Increase
—

 
5.5

(a) 
5.5

Income tax impact
—

 
(1.3
)
 
(1.3
)
Amounts reclassified from accumulated other comprehensive income (loss), net of income taxes:
—

 
4.2

 
4.2

Net current period other comprehensive income (loss):
136.6

 
1.6

 
138.2

Balance, December 31, 2017
$
64.0

 
$
(71.6
)
 
$
(7.6
)
Other comprehensive income (loss) before reclassifications:
 
 
 
 
 
Increase (decrease)
(127.3
)
 
0.3

 
(127.0
)
Income tax impact
—

 
(0.2
)
 
(0.2
)
Other comprehensive income (loss) before reclassifications, net of income taxes
(127.3
)
 
0.1

 
(127.2
)
Amounts reclassified from accumulated other comprehensive income (loss):
 
 
 
 
 
Increase
—

 
4.3

(a) 
4.3

Income tax impact
—

 
(0.8
)
 
(0.8
)
Amounts reclassified from accumulated other comprehensive income (loss), net of income taxes
—

 
3.5

 
3.5

Net current period other comprehensive income (loss)
(127.3
)
 
3.6

 
(123.7
)
Divestiture of A&S Business
34.0

 
10.7

 
44.7

Balance, December 31, 2018
$
(29.3
)
 
$
(57.3
)
 
$
(86.6
)
Other comprehensive income (loss) before reclassifications:
 
 
 
 
 
Increase (decrease)
50.5

 
(29.8
)
 
20.7

Income tax impact
—

 
7.3

 
7.3

Other comprehensive income (loss) before reclassifications, net of income taxes
50.5

 
(22.5
)
 
28.0

Amounts reclassified from accumulated other comprehensive income (loss):
 
 
 
 
 
Increase
—

 
3.1

(a) 
3.1

Income tax impact
—

 
(0.8
)
 
(0.8
)
Amounts reclassified from accumulated other comprehensive income (loss), net of income taxes:
—

 
2.3

 
2.3

Net current period other comprehensive income (loss)
50.5

 
(20.2
)
 
30.3

Balance, December 31, 2019
$
21.2

 
$
(77.5
)
 
$
(56.3
)
 
 
 
 
 
 
(a) This component of AOCI is included in the computation of net periodic pension cost (refer to Note 12 for additional details) and also includes activity related to the divestiture of the A&S Business.
(b) Includes balances relating to employee defined benefit plans, supplemental executive retirement plans, and other postretirement employee benefit plans.