The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 45
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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Goodwill and Intangible Assets, net - Narrative (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Apr. 01, 2016
Goodwill [Line Items]
Goodwill recognized through acquisitions	$ 64.0
Amortization expense	16.5	$ 14.2
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2016	15.3
2017	31.9
2018	30.4
2019	28.4
2020	27.3
2021	$ 26.5
Minimum
Goodwill [Line Items]
Reporting unit, percentage of fair value in excess of carrying amount			75.00%
Maximum
Goodwill [Line Items]
Reporting unit, percentage of fair value in excess of carrying amount			315.00%