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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
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Restructuring Reserve [Roll Forward]
Additional provisions	$ 25.4	$ 26.9		$ 82.1	$ 118.5
Total
Restructuring Reserve [Roll Forward]
Balance at beginning of period	36.6		$ 44.4
Additional provisions	15.8
Payments	(8.0)
Changes in estimates	(0.5)
Translation adjustments	0.5
Balance at end of period	44.4			36.6
Total | Forecast
Restructuring Reserve [Roll Forward]
Payments			(22.4)
Expected future utilization on balance at March 31, 2017			22.0
Work-Force Reductions | United States
Restructuring Reserve [Roll Forward]
Balance at beginning of period	1.8		1.3
Additional provisions	0.5
Payments	(0.9)
Changes in estimates	(0.1)
Translation adjustments	0.0
Balance at end of period	1.3			1.8
Work-Force Reductions | United States | Forecast
Restructuring Reserve [Roll Forward]
Payments			(1.3)
Expected future utilization on balance at March 31, 2017			0.0
Work-Force Reductions | International
Restructuring Reserve [Roll Forward]
Balance at beginning of period	33.4		39.2
Additional provisions	12.4
Payments	(6.8)
Changes in estimates	(0.3)
Translation adjustments	0.5
Balance at end of period	39.2			33.4
Work-Force Reductions | International | Forecast
Restructuring Reserve [Roll Forward]
Payments			(20.2)
Expected future utilization on balance at March 31, 2017			19.0
Idle Leased Facilities
Restructuring Reserve [Roll Forward]
Balance at beginning of period	1.4		3.9
Additional provisions	2.9
Payments	(0.3)
Changes in estimates	(0.1)
Translation adjustments	0.0
Balance at end of period	$ 3.9			$ 1.4
Idle Leased Facilities | Forecast
Restructuring Reserve [Roll Forward]
Payments			(0.9)
Expected future utilization on balance at March 31, 2017			$ 3.0

X

- Definition

Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

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