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Description Of Business And Summary Of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Loss
Changes in accumulated other comprehensive loss in 2015, 2014 and 2013 were as follows:
(In millions)
 
Cumulative Translation Adjustment
 
Pension and other post-retirement benefits
 
Unrealized gain in available-for-sale securities
 
Total
Balance at January 1, 2013
 
$
(16.5
)
 
$
5.2

 
$
0.2

 
$
(11.1
)
Translation adjustments
 
(3.7
)
 
—

 
—

 
(3.7
)
Balance at December 31, 2013
 
(20.2
)
 
5.2

 
0.2

 
(14.8
)
Translation adjustments
 
(27.5
)
 
—

 
—

 
(27.5
)
Balance at December 31, 2014
 
(47.7
)
 
5.2

 
0.2

 
(42.3
)
Translation adjustments
 
(29.1
)
 
—

 
—

 
(29.1
)
Unrecognized gain on available-for-sale securities
 
—

 
—

 
0.1

 
0.1

Balance at December 31, 2015
 
$
(76.8
)
 
$
5.2

 
$
0.3

 
$
(71.3
)