Acquisitions (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Fair Value of Purchase Consideration [Abstract]
Net cash outflow	$ 4.6	$ 18.1	$ 17.2
Purchase Price Allocation [Abstract]
Goodwill	215.7us-gaap_Goodwill	240.2us-gaap_Goodwill	243.8us-gaap_Goodwill
Bargain purchase gain	0	0	0
Brazilian Acquisition [Member]
Fair Value of Purchase Consideration [Abstract]
Cash paid for acquired entity	25.9
Fair value of contingent consideration	1.8
Fair value of purchase consideration	27.7
Net cash outflow	16.0
Purchase Price Allocation [Abstract]
Cash	10.0
Accounts receivable	7.8
Other current assets	19.9
Property and equipment, net	4.0
Indefinite-lived intangible asset	11.8
Goodwill	14.0
Current liabilities	(38.8)
Noncurrent liabilities	(1.0)
Fair value of net assets acquired	27.7
Fair value of purchase consideration	$ 27.7

In a business combination in which the amount of net identifiable assets acquired and liabilities assumed exceeds the aggregate consideration transferred or to be transferred (as defined), this element represents the amount of gain recognized by the entity.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Amount of liability recognized arising from contingent consideration in a business combination.

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Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Amount of other assets expected to be realized or consumed before one year or the normal operating cycle, if longer, acquired at the acquisition date.

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Amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date.

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Amount of liabilities due within one year or within the normal operating cycle, if longer, assumed at the acquisition date.

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Amount of assets, excluding financial assets and goodwill, that lack physical substance, having a projected indefinite period of benefit, acquired at the acquisition date.

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Amount of liabilities due after one year or the normal operating cycle, if longer, assumed at the acquisition date.

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The amount of property, plant, and equipment recognized as of the acquisition date.

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Amount recognized for assets, including goodwill, in excess of (less than) the aggregate liabilities assumed.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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