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Accumulated Comprehensive Loss (Tables)
 12 Months Ended
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
Other comprehensive income activity, net of tax, is provided in the following table for the years ended December 31, 2018, 2017 and 2016.
 
 
 
Pension adjustments
 
 
 
 
 
 
Dollar amounts in millions
Foreign
currency
translation
adjustments
 
Actuarial losses
 
Prior service costs
 
Unrealized
gain (loss)
on investments
 
Other
 
Total
Balance at January 1, 2016
$
(55.1
)
 
$
(87.8
)
 
$
(5.5
)
 
$
3.3

 
$
(1.0
)
 
$
(146.1
)
Other comprehensive income (loss) before reclassifications
8.8

 
(5.3
)
 
—

 
(1.0
)
 
0.4

 
2.9

Income taxes
—

 
1.9

 
—

 
0.4

 
(0.1
)
 
2.2

Net other comprehensive income (loss) before reclassifications
8.8

 
(3.4
)
 
—

 
(0.6
)
 
0.3

 
5.1

Amounts reclassified from accumulated comprehensive income (loss)
—

 
5.5

 
0.5

 
—

 
—

 
6.0

Income taxes
—

 
(2.0
)
 
(0.2
)
 
—

 
—

 
(2.2
)
Net amounts reclassified from cumulative other comprehensive income (loss)
—

 
3.5

 
0.3

 
—

 
—

 
3.8

Total other comprehensive income (loss)
8.8

 
0.1

 
0.3

 
(0.6
)
 
0.3

 
8.9

Balance at December 31, 2016
(46.3
)
 
(87.7
)
 
(5.2
)
 
2.7

 
(0.7
)
 
(137.2
)
Other comprehensive income (loss) before reclassifications
6.6

 
3.2

 
—

 
1.3

 
(0.9
)
 
10.2

Income taxes
—

 
(1.1
)
 
—

 
(0.5
)
 
0.2

 
(1.4
)
Net other comprehensive income (loss) before reclassifications
6.6

 
2.1

 
—

 
0.8

 
(0.7
)
 
8.8

Amounts reclassified from accumulated comprehensive income (loss)
—

 
9.3

 
0.5

 
—

 
(0.1
)
 
9.7

Income taxes
—

 
(3.2
)
 
(0.2
)
 
—

 
—

 
(3.4
)
Net amounts reclassified from cumulative other comprehensive income (loss)
—

 
6.1

 
0.3

 
—

 
(0.1
)
 
6.3

Total other comprehensive income (loss)
6.6

 
8.2

 
0.3

 
0.8

 
(0.8
)
 
15.1

Balance at December 31, 2017
(39.7
)
 
(79.5
)
 
(4.9
)
 
3.5

 
(1.5
)
 
(122.1
)
Effect of adoption of ASU 2018-02
—

 
(17.4
)
 
—

 
0.7

 
—

 
(16.7
)
Other comprehensive income (loss) before reclassifications
(17.3
)
 
4.1

 
—

 
0.1

 
0.7

 
(12.4
)
Income taxes
—

 
(1.1
)
 
—

 
—

 
(0.2
)
 
(1.3
)
Net other comprehensive income (loss) before reclassifications
(17.3
)
 
3.0

 
—

 
0.1

 
0.5

 
(13.7
)
Amounts reclassified from accumulated comprehensive income (loss)
—

 
7.6

 
0.5

 
—

 
—

 
8.1

Income taxes
—

 
(1.9
)
 
(0.1
)
 
—

 
—

 
(2.0
)
Net amounts reclassified from cumulative other comprehensive income (loss)
—

 
5.7

 
0.4

 
—

 
—

 
6.1

Total other comprehensive income (loss)
(17.3
)
 
8.7

 
0.4

 
0.1

 
0.5

 
(7.6
)
Balance at December 31, 2018
$
(57.0
)
 
$
(88.2
)
 
$
(4.5
)
 
$
4.3

 
$
(1.0
)
 
$
(146.4
)