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Comprehensive Income - Schedule of Changes in Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Accumulated Other Comprehensive Income Loss [Line Items]    
Balance at Beginning of Period $ (773.6) $ (488.1)
Other comprehensive loss before reclassifications (54.6) (15.1)
Amounts reclassified from accumulated other comprehensive loss 6.7 3.4
Amounts reclassified due to disposition of an operating entity 16.9  
Net change in accumulated other comprehensive loss (31.0) (11.7)
Balance at End of Period (804.6) (499.8)
Changes in the Fair Value of Derivatives    
Accumulated Other Comprehensive Income Loss [Line Items]    
Balance at Beginning of Period (0.1) (0.2)
Amounts reclassified from accumulated other comprehensive loss 0.1 0.1
Net change in accumulated other comprehensive loss 0.1 0.1
Balance at End of Period   (0.1)
Pension and Other Postretirement Benefits Plan Cost    
Accumulated Other Comprehensive Income Loss [Line Items]    
Balance at Beginning of Period (762.3) (521.4)
Amounts reclassified from accumulated other comprehensive loss 6.6 3.3
Amounts reclassified due to disposition of an operating entity 3.8  
Net change in accumulated other comprehensive loss 10.4 3.3
Balance at End of Period (751.9) (518.1)
Translation Adjustments    
Accumulated Other Comprehensive Income Loss [Line Items]    
Balance at Beginning of Period (11.2) 33.5
Other comprehensive loss before reclassifications (54.6) (15.1)
Amounts reclassified due to disposition of an operating entity 13.1  
Net change in accumulated other comprehensive loss (41.5) (15.1)
Balance at End of Period $ (52.7) $ 18.4