Cost Reduction Actions - Individual Components of Work Force Reduction and Idle Lease Cost (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Restructuring Reserve [Roll Forward]
Charges for work-force reductions / Additional provisions	$ 31.9	$ 17.4	$ 69.0	$ 70.0	$ 118.5
Work-force reduction costs
Restructuring Reserve [Roll Forward]
Balance at beginning of period			33.0
Charges for work-force reductions / Additional provisions			60.3		78.8
Payments			(49.9)		(45.3)
Changes in estimates and revisions			(5.4)
Translation adjustments			1.2		(0.5)
Balance at end of period	39.2		39.2		33.0
Work-force reduction costs | 2016 remaining three months
Restructuring Reserve [Roll Forward]
Expected future payments on balance at September 30, 2016	11.0		11.0
Work-force reduction costs | Beyond 2016
Restructuring Reserve [Roll Forward]
Expected future payments on balance at September 30, 2016	28.2		28.2
Work-force reduction costs | United States
Restructuring Reserve [Roll Forward]
Balance at beginning of period			4.2
Charges for work-force reductions / Additional provisions			6.8		27.9
Payments			(8.2)		(23.7)
Changes in estimates and revisions			(1.0)
Translation adjustments			0.0		0.0
Balance at end of period	1.8		1.8		4.2
Work-force reduction costs | United States | 2016 remaining three months
Restructuring Reserve [Roll Forward]
Expected future payments on balance at September 30, 2016	1.5		1.5
Work-force reduction costs | United States | Beyond 2016
Restructuring Reserve [Roll Forward]
Expected future payments on balance at September 30, 2016	0.3		0.3
Work-force reduction costs | Non-US
Restructuring Reserve [Roll Forward]
Balance at beginning of period			28.8
Charges for work-force reductions / Additional provisions			53.5		50.9
Payments			(41.7)		(21.6)
Changes in estimates and revisions			(4.4)
Translation adjustments			1.2		(0.5)
Balance at end of period	37.4		37.4		$ 28.8
Work-force reduction costs | Non-US | 2016 remaining three months
Restructuring Reserve [Roll Forward]
Expected future payments on balance at September 30, 2016	9.5		9.5
Work-force reduction costs | Non-US | Beyond 2016
Restructuring Reserve [Roll Forward]
Expected future payments on balance at September 30, 2016	$ 27.9		$ 27.9