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Other Intangible Assets - Summary of Other Intangible Assets (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Gross cost at January 1			$ 247.6	$ 175.5
Capitalization of internally developed software			5.1	3.0
Exchange effect			0.0	0.1
Gross cost at June 30	$ 252.7	$ 178.6	252.7	178.6
Accumulated amortization at January 1			(66.5)	(48.7)
Amortization expense	(5.3)	(4.4)	(10.4)	(8.8)
Exchange effect			0.1	0.0
Accumulated amortization at June 30	(76.8)	(57.5)	(76.8)	(57.5)
Net book amount at June 30	$ 175.9	$ 121.1	$ 175.9	$ 121.1	$ 181.1

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Amount of increase (decrease) to amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life for foreign currency translation adjustments.

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Additions made to capitalized computer software costs during the period.

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

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