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Assets Held for Sale (Tables)
9 Months Ended
Sep. 30, 2012
Property, Plant and Equipment Assets Held-for-sale Disclosure [Abstract]  
Disclosure of Long Lived Assets Held-for-sale
The following table summarizes changes in assets held for sale during the nine months ended September 30, 2012:
 
 
(In millions)
Balance, December 31, 2011
$
9.4

Assets transferred to held for sale
54.7

Assets sold
(45.2
)
Other
(2.5
)
Balance, September 30, 2012
$
16.4