Summary of Significant Accounting Policies - Revenue Recognition and Other (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Intangibles
Impairment losses of intangible assets, finite-lived			$ 14.4
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)		$ 36.4	21.2
Revenue Recognition
Shipping and handling costs included in operating expenses	$ 372.3	346.2	319.1
Share-Based Compensation
Stock-based compensation expense	33.4	24.4	$ 21.3
Foreign Currencies
Net (loss) gain resulting from foreign currency transactions	$ (4.9)	$ 1.8

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Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.

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The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value.

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Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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Cost incurred during the reporting period in transporting goods and services to customers. Includes freight-out costs.

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