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Summary of Significant Accounting Policies - Marketable Securities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Accounting Policies [Abstract]
Percentage of ownership in Swiss franchise	49.00%
Swiss franchise investment portfolio market value	$ 234.8	$ 207.0
Swiss franchise realized gains	14.7	2.9	$ 2.3
Swiss franchise realized losses	3.8	1.0	1.1
Other-than-temporary impairment gains	$ (1.6)	$ (0.3)	$ (0.2)

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- Definition

Other than Temporary Impairment Gains, Investments, Portion Recognized in Earnings, Net, Available-for-sale Securities

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Investment in debt and equity securities that are categorized as neither held-to-maturity or trading, associated with a Swiss franchise in which we hold a 49 percent interest.

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This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a)
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a)
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