Reconciliation of Benefit Obligation, Plan Assets and Funded Status of Plans (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]
Plan amendments and other	$ (30.1)
Employer contributions	29.6	148.7	54.6
Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation at beginning of year	4,368.8	3,923.6
Service cost	2.2	5.9	86.6
Interest cost	178.2	189.2	192.0
Plan participants’ contributions	0.5	1.2
Medicare reimbursements
Actuarial (gain) loss	(404.2)	411.2
Plan amendments and other	(0.1)	2.6
Curtailments and settlements	(9.0)	(6.5)
Foreign currency translation	(8.5)	17.5
Benefits paid	(175.2)	(175.9)
Benefit obligation at end of year	3,952.7	4,368.8	3,923.6
Fair value of plan assets at beginning of year	3,215.3	2,849.6
Actual return on assets	658.0	389.9
Settlements	(8.7)	(3.7)
Employer contributions	21.6	140.7
Medicare reimbursements
Plan participants’ contributions	0.5	1.2
Other
Foreign currency translation	(4.2)	13.5
Benefits paid	(175.2)	(175.9)
Fair value of plan assets at end of year	3,707.3	3,215.3	2,849.6
Funded status at end of year	(245.4)	(1,153.5)
Other Postretirement Benefit Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation at beginning of year	430.2	403.1
Service cost	7.3	6.6	8.2
Interest cost	16.2	18.4	22.7
Plan participants’ contributions	14.5	14.4
Medicare reimbursements	2.7	3.3
Actuarial (gain) loss	(13.6)	27.6
Plan amendments and other	(30.6)	0.5
Curtailments and settlements
Foreign currency translation	(2.9)	1.1
Benefits paid	(41.5)	(44.8)
Benefit obligation at end of year	382.3	430.2	403.1
Fair value of plan assets at beginning of year	187.1	174.7
Actual return on assets	35.6	21.0
Settlements
Employer contributions	8.0	8.0
Medicare reimbursements	2.7	3.3
Plan participants’ contributions	14.5	14.4
Other		10.2
Foreign currency translation	0.4	0.3
Benefits paid	(41.5)	(44.8)
Fair value of plan assets at end of year	206.8	187.1	174.7
Funded status at end of year	$ (175.5)	$ (243.1)