Other Post-Employment Benefits and Other Employee Benefit Plans - Funded Status for Pension Plans (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Change in benefit obligation:
Projected benefit obligation at beginning of Period	$ 1,262.6	$ 1,221.9
Service cost	10.0	12.3	16.1
Interest cost	48.0	43.4	46.6
Plan participants’ contributions	3.4	3.6
Actuarial loss (gain)	217.9	22.7
Benefits paid	(48.6)	(41.0)
Loss due to exchange rate movements	115.6	(12.0)
Projected benefit obligation at end of period	1,368.3	1,262.6	1,221.9
Change in plan assets:
Fair value of plan assets at beginning of period	1,023.2	961.6
Employer contributions	36.1	34.3
Plan participants’ contribution	(3.4)	(3.6)
Benefits paid	(48.6)	(41.0)
Fair value of plan assets at end of period	1,045.0	1,023.2	961.6
Net amount recognized:
Underfunded status	(323.3)	(239.4)
Net amount recognized in consolidated balance sheets consists of:
Net amount recognized	(323.3)	(239.4)
Amounts recognized in accumulated other comprehensive income consist of:
Net actuarial loss	308.1	197.3
Prior service credit	0.5	0.8
Total	308.6	198.1
Other Post-Employment Benefits and Other Employee Benefit Plans [Member]
Change in benefit obligation:
Service cost	0.8	0.9	1.0
Interest cost	3.2	3.0	3.3
Net amount recognized:
Underfunded status	(79.8)	(73.1)
Net amount recognized in consolidated balance sheets consists of:
Current liability	(5.3)	(5.7)
Noncurrent liability	(74.5)	(67.4)
Net amount recognized	(79.8)	(73.1)
Amounts recognized in accumulated other comprehensive income consist of:
Net actuarial loss	13.8	6.9
Prior service credit	(11.2)	(12.1)
Total	2.6	(5.2)
Change in benefit obligation [Member] | Other Post-Employment Benefits and Other Employee Benefit Plans [Member]
Change in benefit obligation:
Projected benefit obligation at beginning of Period	73.1	79.9
Service cost	0.8	0.9
Interest cost	3.2	3.0
Actuarial loss (gain)	7.2	(6.0)
Benefits paid	(4.2)	(5.2)
Loss due to exchange rate movements	(0.5)	(0.1)
Plan amendments	0.2	0.6
Projected benefit obligation at end of period	79.8	73.1
Change in plan assets:
Benefits paid	(4.2)	(5.2)
Change in plan assets [Member] | Other Post-Employment Benefits and Other Employee Benefit Plans [Member]
Change in benefit obligation:
Benefits paid	(4.2)	(5.2)
Change in plan assets:
Employer contributions	4.2	5.2
Benefits paid	$ (4.2)	$ (5.2)