Comprehensive Income - Schedule of Changes in Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at Beginning of Period	$ (793.2)	$ (773.6)
Other comprehensive income (loss) before reclassifications	18.8	(22.8)
Amounts reclassified from accumulated other comprehensive loss	(1.8)	2.2
Amounts reclassified due to the disposition of businesses	0.1
Net change in accumulated other comprehensive loss	17.1	(20.6)
Balance at End of Period	(776.1)	(794.2)
Pension and Other Postretirement Benefits Plan Cost
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at Beginning of Period	(727.5)	(762.3)
Other comprehensive income (loss) before reclassifications	0.0	0.0
Amounts reclassified from accumulated other comprehensive loss	(1.8)	2.2
Amounts reclassified due to the disposition of businesses	1.2
Net change in accumulated other comprehensive loss	(0.6)	2.2
Balance at End of Period	(728.1)	(760.1)
Translation Adjustments
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at Beginning of Period	(65.7)	(11.2)
Other comprehensive income (loss) before reclassifications	18.8	(22.8)
Amounts reclassified from accumulated other comprehensive loss	0.0	0.0
Amounts reclassified due to the disposition of businesses	(1.1)
Net change in accumulated other comprehensive loss	17.7	(22.8)
Balance at End of Period	$ (48.0)	(34.0)
Changes in the Fair Value of Derivatives
Accumulated Other Comprehensive Income Loss [Line Items]
Balance at Beginning of Period		(0.1)
Other comprehensive income (loss) before reclassifications		0.0
Amounts reclassified from accumulated other comprehensive loss		0.0
Net change in accumulated other comprehensive loss		0.0
Balance at End of Period		$ (0.1)