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8. Accumulated Other Comprehensive Income Accumulated Other Comprehensive Income (Tables)
 12 Months Ended
Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Accumulated other comprehensive income included in our Consolidated Balance Sheets and Consolidated Statements of Changes in Stockholders' Equity consists of the following components (in millions):
 
Foreign currency translation adjustments
Foreign other post-employment benefits adjustments
Net unrealized holding gains on available-for-sale investments
Total Accumulated other comprehensive income
Balances as of January 1, 2016
$
33.7

$
(20.7
)
$
369.1

$
382.1

Other comprehensive (loss) income, before reclassifications
(32.4
)
0.5

105.1

73.2

Amounts reclassified from Accumulated other comprehensive income
—

2.5

(0.8
)
1.7

Income tax effects
—

(0.9
)
(38.4
)
(39.3
)
Other comprehensive (loss) income, net of income taxes
(32.4
)
2.1

65.9

35.6

Balances as of December 31, 2016
$
1.3

$
(18.6
)
$
435.0

$
417.7

Other comprehensive income (loss), before reclassifications
76.1

(6.5
)
203.6

273.2

Amounts reclassified from Accumulated other comprehensive income
—

2.1

(0.1
)
2.0

Income tax effects
—

0.7

(74.9
)
(74.2
)
Effect of adoption of ASU 2018-02**
—

—

120.1

120.1

Other comprehensive income (loss), net of income taxes
76.1

(3.7
)
248.7

321.1

Balances as of December 31, 2017
$
77.4

$
(22.3
)
$
683.7

$
738.8