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Financial Instruments (Details) - USD ($) $ in Millions | Dec. 31, 2015 | Dec. 31, 2014
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Summary of financial assets with original maturities of less than 90 days included within cash and cash equivalents |  |
Cash equivalents | $ 909.5 | $ 716.3
Commercial Paper |  |
Summary of financial assets with original maturities of less than 90 days included within cash and cash equivalents |  |
Cash equivalents | 21.9 | 54.2
Overnight Reverse Repurchase Agreements |  |
Summary of financial assets with original maturities of less than 90 days included within cash and cash equivalents |  |
Cash equivalents | 134.7 | 305.0
Money Market Funds |  |
Summary of financial assets with original maturities of less than 90 days included within cash and cash equivalents |  |
Cash equivalents | 673.8 | 321.2
Short-term Debt Securities |  |
Summary of financial assets with original maturities of less than 90 days included within cash and cash equivalents |  |
Cash equivalents | $ 79.1 | $ 35.9

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