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Shareholders' Equity
 9 Months Ended
Sep. 30, 2019
Equity [Abstract]  
Stockholders' Equity Note Disclosure [Text Block] Shareholders’ Equity

The following table presents the changes in shareholders’ equity for the nine months ended September 30, 2019:

 
Common Shares Issued
 
Common Stock
 
Capital in Excess of Par Value
 
Number of Treasury Shares
 
Treasury Stock
 
Retained earnings
 
Accumulated other comprehensive loss
 
Total
($ in millions)
 
 
 
 
 
 
 
Balance, December 31, 2018
75.3

 
$
18.8

 
$
282.0

 
1.2

 
$
(103.7
)
 
$
1,353.4

 
$
(154.2
)
 
$
1,396.3

Net income
—

 
—

 
—

 
—

 
—

 
55.4

 
—

 
55.4

Activity related to stock-based compensation
—

 
—

 
(3.5
)
 
(0.2
)
 
14.2

 
—

 
—

 
10.7

Shares purchased under share repurchase program
—

 
—

 
—

 
0.8

 
(83.1
)
 
—

 
—

 
(83.1
)
Dividends declared ($0.15 per share)
—

 
—

 
—

 
—

 
—

 
(10.6
)
 
—

 
(10.6
)
Other comprehensive income, net of tax
—

 
—

 
—

 
—

 
—

 
—

 
0.8

 
0.8

Balance, March 31, 2019
75.3

 
$
18.8

 
$
278.5

 
1.8

 
$
(172.6
)
 
$
1,398.2

 
$
(153.4
)
 
$
1,369.5

Net income
—

 
—

 
—

 
—

 
—

 
66.1

 
—

 
66.1

Activity related to stock-based compensation
—

 
—

 
(5.1
)
 
(0.2
)
 
24.8

 
—

 
—

 
19.7

Dividends declared ($0.15 per share)
—

 
—

 
—

 
—

 
—

 
(11.4
)
 
—

 
(11.4
)
Other comprehensive income, net of tax
—

 
—

 
—

 
—

 
—

 
—

 
1.2

 
1.2

Balance, June 30, 2019
75.3

 
$
18.8

 
$
273.4

 
1.6

 
$
(147.8
)
 
$
1,452.9

 
$
(152.2
)
 
$
1,445.1

Net income
—

 
—

 
—

 
—

 
—

 
56.3

 
—

 
56.3

Activity related to stock-based compensation
—

 
—

 
(4.9
)
 
(0.3
)
 
21.2

 
—

 
—

 
16.3

Dividends declared ($0.16 per share)
—

 
—

 
—

 
—

 
—

 
(11.9
)
 
—

 
(11.9
)
Other comprehensive loss, net of tax
—

 
—

 
—

 
—

 
—

 
—

 
(18.2
)
 
(18.2
)
Balance, September 30, 2019
75.3

 
$
18.8

 
$
268.5

 
1.3

 
$
(126.6
)
 
$
1,497.3

 
$
(170.4
)
 
$
1,487.6



The following table presents the changes in shareholders’ equity for the nine months ended September 30, 2018:

 
Common Shares Issued
 
Common Stock
 
Capital in Excess of Par Value
 
Number of Treasury Shares
 
Treasury Stock
 
Retained earnings
 
Accumulated other comprehensive loss
 
Total
($ in millions)
 
 
 
 
 
 
 
Balance, December 31, 2017
75.2

 
$
18.8

 
$
309.3

 
1.3

 
$
(109.1
)
 
$
1,178.2

 
$
(117.3
)
 
$
1,279.9

Effect of modified retrospective application of a new accounting standard
—

 
—

 
—

 
—

 
—

 
11.4

 
—

 
11.4

Net income
—

 
—

 
—

 
—

 
—

 
43.6

 
—

 
43.6

Activity related to stock-based compensation
0.1

 
—

 
(0.8
)
 
(0.1
)
 
8.0

 
—

 
—

 
7.2

Shares purchased under share repurchase program
—

 
—

 
—

 
0.5

 
(47.9
)
 
—

 
—

 
(47.9
)
Dividends declared ($0.14 per share)
—

 
—

 
—

 
—

 
—

 
(10.4
)
 
—

 
(10.4
)
Other comprehensive income, net of tax
—

 
—

 
—

 
—

 
—

 
—

 
21.5

 
21.5

Balance, March 31, 2018
75.3

 
$
18.8

 
$
308.5

 
1.7

 
$
(149.0
)
 
$
1,222.8

 
$
(95.8
)
 
$
1,305.3

Net income
—

 
—

 
—

 
—

 
—

 
56.1

 
—

 
56.1

Activity related to stock-based compensation
—

 
—

 
(3.8
)
 
(0.2
)
 
16.0

 
—

 
—

 
12.2

Shares purchased under share repurchase program
—

 
—

 
—

 
0.3

 
(22.9
)
 
—

 
—

 
(22.9
)
Dividends declared ($0.14 per share)
—

 
—

 
—

 
—

 
—

 
(20.9
)
 
—

 
(20.9
)
Other comprehensive loss, net of tax
—

 
—

 
—

 
—

 
—

 
—

 
(47.9
)
 
(47.9
)
Balance, June 30, 2018
75.3

 
$
18.8

 
$
304.7

 
1.8

 
$
(155.9
)
 
$
1,258.0

 
$
(143.7
)
 
$
1,281.9

Net income
—

 
—

 
—

 
—

 
—

 
55.2

 
—

 
55.2

Activity related to stock-based compensation
—

 
—

 
(21.9
)
 
(0.6
)
 
47.2

 
—

 
—

 
25.3

Dividends declared ($0.15 per share)
—

 
—

 
—

 
—

 
—

 
(0.5
)
 
—

 
(0.5
)
Other comprehensive loss, net of tax
—

 
—

 
—

 
—

 
—

 
—

 
(10.1
)
 
(10.1
)
Balance, September 30, 2018
75.3

 
$
18.8

 
$
282.8

 
1.2

 
$
(108.7
)
 
$
1,312.7

 
$
(153.8
)
 
$
1,351.8