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Accumulated Other Comprehensive Loss - Schedule of Changes in Accumulated Other Comprehensive Income (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Accumulated Comprehensive Income Loss [Line Items]        
Marketable securities, Balance at beginning of year $ 1.9 $ (5.6) $ 2.1 $ 6.4
Marketable securities, Unrealized gain (loss) arising during the year 1.0 5.4 0.8 (6.6)
Marketable securities, Balance at end of year 2.9 (0.2) 2.9 (0.2)
Currency translation adjustment, Balance at beginning of year 36.3 19.5 53.3 37.5
Other comprehensive income (loss) 16.9 30.8 (0.1) 12.8
Currency translation adjustment, Balance at end of year 53.2 50.3 53.2 50.3
Balance at beginning of period (55.5) (50.8) (42.0) (23.3)
Total other comprehensive income (loss), net 19.7 37.4 6.2 9.9
Balance at end of period (35.8) (13.4) (35.8) (13.4)
Defined Benefit Pension Plans
        
Accumulated Comprehensive Income Loss [Line Items]        
Balance at beginning of year (97.3) (69.6) (101.5) (72.6)
Pension and other postretirement benefit plan 2.1 1.5 6.3 4.5
Balance at end of year (95.2) (68.1) (95.2) (68.1)
OPEB
        
Accumulated Comprehensive Income Loss [Line Items]        
Balance at beginning of year 3.6 4.9 4.1 5.4
Balance at end of year 3.3 4.6 3.3 4.6
Amortization of prior service credit $ (0.3) $ (0.3) $ (0.8) $ (0.8)