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Accumulated Other Comprehensive Income Activity (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			$ (53.4)
OCI excluding reclassifications			(10.1)
Reclassifications to earnings			(6.0)
OCI, net of tax	19.8	22.0	(16.1)	5.8
Ending Balance	(69.5)		(69.5)
Unrealized Gain On Investment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			0.3
OCI excluding reclassifications			0.2
Reclassifications to earnings
OCI, net of tax			0.2
Ending Balance	0.5		0.5
Accrued Benefit Cost
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			(70.1)
OCI excluding reclassifications
Reclassifications to earnings			3.5
OCI, net of tax			3.5
Ending Balance	(66.6)		(66.6)
Derivative Financial Instruments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			(1.3)
OCI excluding reclassifications			11.6
Reclassifications to earnings			(9.5)
OCI, net of tax			2.1
Ending Balance	0.8		0.8
Cumulative Translation Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			17.7
OCI excluding reclassifications			(21.9)
Reclassifications to earnings
OCI, net of tax			(21.9)
Ending Balance	$ (4.2)		$ (4.2)