Accumulated Other Comprehensive Income - Details of Comprehensive Income (Loss) (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]
Accumulated Other Comprehensive Loss, Net of Taxes, beginning balance	$ (277.4)	[1]	$ (164.9)
Other comprehensive income (loss) before reclassifications	(334.8)		(117.1)
Less: amounts reclassified from accumulated other comprehensive income (loss)	(1.6)		4.6
Net current period other comprehensive income (loss)	(336.4)		(112.5)	[2]	(19.8)	[2]
Accumulated Other Comprehensive Loss, Net of Taxes ending balance	(613.8)		(277.4)	[1]	(164.9)
Unrecognized Pension Items
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated Other Comprehensive Loss, Net of Taxes, beginning balance	(146.2)		(142.3)
Other comprehensive income (loss) before reclassifications	(99.0)		(10.6)
Less: amounts reclassified from accumulated other comprehensive income (loss)	8.7		6.7
Net current period other comprehensive income (loss)	(90.3)		(3.9)
Accumulated Other Comprehensive Loss, Net of Taxes ending balance	(236.5)		(146.2)
Cumulative Translation Adjustment
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated Other Comprehensive Loss, Net of Taxes, beginning balance	(134.4)		(24.1)
Other comprehensive income (loss) before reclassifications	(248.1)		(110.3)
Net current period other comprehensive income (loss)	(248.1)		(110.3)
Accumulated Other Comprehensive Loss, Net of Taxes ending balance	(382.5)		(134.4)
Unrecognized Gains (Losses) on Derivative Instruments
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated Other Comprehensive Loss, Net of Taxes, beginning balance	3.2		1.5
Other comprehensive income (loss) before reclassifications	12.3		3.8
Less: amounts reclassified from accumulated other comprehensive income (loss)	(10.3)		(2.1)
Net current period other comprehensive income (loss)	2.0		1.7
Accumulated Other Comprehensive Loss, Net of Taxes ending balance	$ 5.2		$ 3.2

[1] Certain amounts have been revised to reflect the retrospective application of the Company’s change in inventory costing method for certain U.S. inventories to the FIFO method from the LIFO method. Refer to Note 2, “Summary of Significant Accounting Policies - Inventories,” of the notes to consolidated financial statements for further details surrounding this accounting policy change.

[2] Certain amounts have been revised to reflect the retrospective application of the Company’s change in inventory costing method for certain U.S. inventories to the FIFO method from the LIFO method. Refer to Note 2, “Summary of Significant Accounting Policies - Inventories,” of the notes to consolidated financial statements for further details surrounding this accounting policy change.