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Commitments and Contingencies - Summary of Changes in Warranty Liabilities (Detail) (USD $)
In Millions, unless otherwise specified
 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Commitments and Contingencies Disclosure [Abstract]    
Product Warranty Accrual, Warranties Issued $ 3.5 $ 4.5
Product Warranty Accrual, Payments 3.5 3.7
Schedule of Product Warranty Liability [Table Text Block]
The following table summarizes the changes in the Company’s warranty liabilities:
 
Six Months Ended 
 June 30,
(in millions)
2014
 
2013
Balance at January 1
$
8.4

 
$
6.8

Provisions to expense
3.5

 
4.5

Payments
(3.5
)
 
(3.7
)
Balance at June 30
$
8.4

 
$
7.6

  
Movement in Standard and Extended Product Warranty, Increase (Decrease) [Roll Forward]    
Balance at January 1 8.4 6.8
Balance at September 30 $ 8.4 $ 7.6