Accumulated Other Comprehensive Income (Loss) - Details of Comprehensive Income (Loss) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated Other Comprehensive Income (loss), Net of Taxes, beginning balance	$ (613.8)	$ (277.4)
Other comprehensive income (loss) before reclassifications	(53.3)	2.0
Less: amounts reclassified from accumulated other comprehensive income (loss)	(8.2)	0.5
Other comprehensive (loss) income, net of taxes	(61.5)	2.5
Accumulated Other Comprehensive Income (loss), Net of Taxes ending balance	(675.3)	(274.9)
Unrecognized Pension Items
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated Other Comprehensive Income (loss), Net of Taxes, beginning balance	(236.5)	(146.2)
Other comprehensive income (loss) before reclassifications	14.9	(0.4)
Less: amounts reclassified from accumulated other comprehensive income (loss)	2.4	2.2
Other comprehensive (loss) income, net of taxes	17.3	1.8
Accumulated Other Comprehensive Income (loss), Net of Taxes ending balance	(219.2)	(144.4)
Cumulative Translation Adjustment
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated Other Comprehensive Income (loss), Net of Taxes, beginning balance	(382.5)	(134.4)
Other comprehensive income (loss) before reclassifications	(72.8)	2.4
Other comprehensive (loss) income, net of taxes	(72.8)	2.4
Accumulated Other Comprehensive Income (loss), Net of Taxes ending balance	(455.3)	(132.0)
Unrecognized Gains (Losses) on Derivative Instruments
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated Other Comprehensive Income (loss), Net of Taxes, beginning balance	5.2	3.2
Other comprehensive income (loss) before reclassifications	4.6
Less: amounts reclassified from accumulated other comprehensive income (loss)	(10.6)	(1.7)
Other comprehensive (loss) income, net of taxes	(6.0)	(1.7)
Accumulated Other Comprehensive Income (loss), Net of Taxes ending balance	$ (0.8)	$ 1.5

- Definition

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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