Changes in Accumulated Other Comprehensive Income (Loss) by Component (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ (20.9)		$ (81.2)		$ (66.6)
Other comprehensive income (loss) before reclassifications	(87.8)		74.4		(28.4)
Tax (provision) benefit related to other comprehensive income (loss) before reclassifications	12.9	[1]	(22.2)	[1]	7.8	[1]
Other comprehensive income (loss) before reclassifications, net of taxes	(74.9)		52.2		(20.6)
Amounts reclassified from accumulated other comprehensive income (loss)	10.7		12.7		9.6
Tax provision (benefit) related to amounts reclassified from accumulated other comprehensive income (loss)	(3.7)		(4.6)		(3.6)
Reclassifications, net of tax	7.0		8.1		6.0
Other comprehensive income (loss)	(67.9)		60.3		(14.6)
Ending balance	(88.8)		(20.9)		(81.2)
Derivative Instruments Designated as Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	0		(0.7)		(1.4)
Other comprehensive income (loss) before reclassifications	2.5		1.7		3.6
Tax (provision) benefit related to other comprehensive income (loss) before reclassifications	(2.0)	[1]	(0.2)	[1]	(1.8)	[1]
Other comprehensive income (loss) before reclassifications, net of taxes	0.5		1.5		1.8
Amounts reclassified from accumulated other comprehensive income (loss)	0.6	[2]	(1.2)	[2]	(1.2)	[2]
Tax provision (benefit) related to amounts reclassified from accumulated other comprehensive income (loss)	(0.2)		0.4		0.1
Reclassifications, net of tax	0.4		(0.8)		(1.1)
Other comprehensive income (loss)	0.9		0.7		0.7
Ending balance	0.9		0		(0.7)
Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	47.3		32.6		41.1
Other comprehensive income (loss) before reclassifications	(50.4)		14.7		(8.5)
Tax (provision) benefit related to other comprehensive income (loss) before reclassifications	0	[1]	0	[1]
Other comprehensive income (loss) before reclassifications, net of taxes	(50.4)		14.7		(8.5)
Amounts reclassified from accumulated other comprehensive income (loss)	0		0		0
Tax provision (benefit) related to amounts reclassified from accumulated other comprehensive income (loss)	0		0		0
Reclassifications, net of tax	0		0		0
Other comprehensive income (loss)	(50.4)		14.7		(8.5)
Ending balance	(3.1)		47.3		32.6
Benefit Plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(68.2)	[3]	(113.1)	[3]	(106.3)	[3]
Other comprehensive income (loss) before reclassifications	(39.9)	[3]	58.0	[3]	(23.5)	[3]
Tax (provision) benefit related to other comprehensive income (loss) before reclassifications	14.9	[1],[3]	(22.0)	[1],[3]	9.6	[1],[3]
Other comprehensive income (loss) before reclassifications, net of taxes	(25.0)	[3]	36.0	[3]	(13.9)	[3]
Amounts reclassified from accumulated other comprehensive income (loss)	10.1	[3]	13.9	[3]	10.8	[3]
Tax provision (benefit) related to amounts reclassified from accumulated other comprehensive income (loss)	(3.5)	[3]	(5.0)	[3]	(3.7)	[3]
Reclassifications, net of tax	6.6	[3]	8.9	[3]	7.1	[3]
Other comprehensive income (loss)	(18.4)	[3]	44.9	[3]	(6.8)	[3]
Ending balance	$ (86.6)	[3]	$ (68.2)	[3]	$ (113.1)	[3]

[1] Income taxes are not provided for foreign currency translation adjustment.

[2] See Note 6 of the notes to consolidated financial statements.

[3] These components are included in the computation of net periodic pension cost. See Note 12 of the notes to consolidated financial statements.