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Accumulated Other Comprehensive Loss Accumulated Other Comprehensive Loss (Tables)
 12 Months Ended
Dec. 31, 2018
Accumulated Other Comprehensive Loss [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
 
Postretirement Benefit Plans
 
Cumulative Translation Adjustment
 
Unrealized (Loss) Gain on Investment Securities
 
Accumulated Other Comprehensive Loss
As of December 31, 2015
$
(153.7
)
 
$
(270.0
)
 
$
(0.3
)
 
$
(424.0
)
Net change during period
8.5

 
(36.0
)
 
0.3

 
(27.2
)
As of December 31, 2016
(145.2
)
 
(306.0
)
 
—

 
(451.2
)
Net change during period
7.6

 
95.4

 
—

 
103.0

As of December 31, 2017
(137.6
)
 
(210.6
)
 
—

 
(348.2
)
Net change during period
6.0

 
(33.3
)
 
—

 
(27.3
)
As of December 31, 2018
$
(131.6
)
 
$
(243.9
)
 
$
—

 
$
(375.5
)