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Description Of Business And Summary Of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Loss
Changes in accumulated other comprehensive loss in 2014, 2013 and 2012 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, 2012
 
$
(17.6
)
 
$
16.1

 
$
0.2

 
$
(1.3
)
Translation adjustments
 
1.1

 
—

 
—

 
1.1

Prior service credits recognized during the year, net of tax of $6.5
 
—

 
(10.9
)
 
—

 
(10.9
)
Balance at December 31, 2012
 
(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
)