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Financial Instruments and Risk Management - Cash and Cash Equivalents (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Financial Instruments [Abstract]
Cash	$ 401.5	$ 463.4
Cash equivalents	113.7	93.8
Cash and cash equivalents	$ 515.2	$ 557.2	$ 545.3	$ 565.0

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- Definition

Financial Instruments [Abstract]

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No definition available.

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- Definition

The amount of cash on hand and demand deposits. [Refer: Cash on hand]

+ References

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- Definition

The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents]

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The amount of short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value.

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