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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2017
Stockholders' Equity Note [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
The following table presents changes in comprehensive income:
 
 
Year Ended December 31,
 
 
2017
 
2016
 
2015
 
 
Pretax
Amount
 
Tax
Effect
 
Net
Amount
 
Pretax
Amount
 
Tax
Effect
 
Net
Amount
 
Pretax
Amount
 
Tax
Effect
 
Net
Amount
Unrealized foreign currency translation gains (losses)
 
$
20.0

 
$
—

 
$
20.0

 
$
(7.1
)
 
$
0.4

 
$
(6.7
)
 
$
(15.0
)
 
$
—

 
$
(15.0
)
Unrealized loss on "available-for-sale" securities
 
(0.4
)
 
0.1

 
(0.3
)
 
—

 
—

 
—

 
—

 
—

 
—

Adjustment to pension and other benefit liabilities
 
(13.8
)
 
2.9

 
(10.9
)
 
(10.0
)
 
3.0

 
(7.0
)
 
6.3

 
(1.2
)
 
5.1

Other comprehensive income (loss)
 
$
5.8

 
$
3.0

 
$
8.8

 
$
(17.1
)
 
$
3.4

 
$
(13.7
)
 
$
(8.7
)
 
$
(1.2
)
 
$
(9.9
)
The components of accumulated other comprehensive income (loss), net of applicable income taxes are as follows:
 
 
December 31,
 
 
2017
 
2016
Unrealized foreign currency translation losses, net of income tax benefit of $0.4 and $0.4, respectively
 
$
(7.5
)
 
$
(27.5
)
Unrealized loss on "available-for-sale" securities, net of income tax benefit of $0.1 million
 
(0.3
)
 
—

Net loss from pension and other postretirement benefit liabilities, net of income tax benefits of $28.8 million and $36.8 million, respectively (a)
 
(86.3
)
 
(64.5
)
Accumulated other comprehensive loss
 
$
(94.1
)
 
$
(92.0
)

_________________

(a) In conjunction with the Tax Act, The Company early adopted ASU 2018-02 in the fourth quarter of 2017 and accordingly reclassified $10.9 million related to stranded tax effects resulting from the Tax Act from AOCI to retained earnings. The Company’s policy is to release stranded tax effects for “available-for-sale” securities using the portfolio approach.
Schedules of shares purchased under stock purchase plan
The following table shows shares purchased under the respective stock purchase plans:
 
 
Year Ended December 31,
 
 
2017
 
2016
 
2015
 
 
Shares
 
$
 
Shares
 
$
 
Shares
 
$
2017 Stock Purchase Plan
 
—

 
$
—

 
 
 
 
 
 
 
 
2016 Stock Purchase Plan
 
85,354

 
$
6.8

 
91,542

 
$
7.4

 


 


2015 Stock Purchase Plan
 


 


 
93,600

 
$
5.2

 
42,100

 
$
2.4

2014 Stock Purchase Plan
 


 


 


 


 
60,900

 
$
3.5