v3.8.0.1
Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2017
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):
 
2017
 
2016
Land and improvements
$
67.8

 
$
63.5

Buildings and leasehold improvements
389.7

 
340.8

Machinery and equipment
1,341.8

 
1,147.5

Gross property, plant and equipment
1,799.3

 
1,551.8

Less: accumulated depreciation
(1,086.8
)
 
(1,004.2
)
Property, plant and equipment, net
$
712.5

 
$
547.6
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
The changes in accumulated other comprehensive income (loss) by component are summarized below ($ in millions):
 
Foreign
currency
translation
adjustments
 
Pension & post-
retirement
plan benefit
adjustments (b)
 
Total
Balance, January 1, 2015
$
182.9

 
$
(83.4
)
 
$
99.5

Other comprehensive income (loss) before reclassifications:
 
 
 
 
 
Increase (decrease)
(131.7
)
 
17.6

 
(114.1
)
Income tax impact
—

 
(5.0
)
 
(5.0
)
Other comprehensive income (loss) before reclassifications, net of income taxes
(131.7
)
 
12.6

 
(119.1
)
Amounts reclassified from accumulated other comprehensive income (loss):
 
 
 
 
 
Increase (decrease)
—

 
6.9

(a) 
6.9

Income tax impact
—

 
(1.7
)
 
(1.7
)
Amounts reclassified from accumulated other comprehensive income (loss), net of income taxes:
—

 
5.2

 
5.2

Net current period other comprehensive income (loss):
(131.7
)
 
17.8

 
(113.9
)
Balance, December 31, 2015
51.2

 
(65.6
)
 
(14.4
)
Other comprehensive income (loss) before reclassifications:
 
 
 
 
 
Increase (decrease)
(123.8
)
 
(13.8
)
 
(137.6
)
Income tax impact
—

 
2.0

 
2.0

Other comprehensive income (loss) before reclassifications, net of income taxes
(123.8
)
 
(11.8
)
 
(135.6
)
Amounts reclassified from accumulated other comprehensive income (loss):
 
 
 
 
 
Increase (decrease)
—

 
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)
(123.8
)
 
(7.6
)
 
(131.4
)
Balance, December 31, 2016
(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 (decrease)
—

 
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
)
 
 
 
 
 
 
(a) This accumulated other comprehensive income (loss) component is included in the computation of net periodic pension cost (refer to Note 10 for additional details).
(b) Includes balances relating to non-U.S. employee defined benefit plans, supplemental executive retirement plans and other postretirement employee benefit plans.