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Summary of Significant Accounting Policies - Fair Value Measurements (Details) - Recurring - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Level 2
Fair Value Measurements
Interest rate swap agreements and foreign currency forward contracts, gross asset balance	$ 7.8
Interest rate swap agreements and foreign currency forward contracts, gross liability balance	10.7	$ 18.1
Level 3
Fair Value Measurements
Investments	$ 0.0

- Definition

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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