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Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Narrative) (Details) - Accounting Standards Update 2016-09 [Member] - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2017 | Mar. 31, 2016
Summary of Significant Accounting Policies [Line Items] |  |
Excess tax benefits recognized | $ 20.0 |
Excess Tax Benefits [Member] |  |
Summary of Significant Accounting Policies [Line Items] |  |
Decrease in net cash used for operations and net cash provided by financing activities | 20.0 | $ 15.0
Employee Taxes Paid [Member] |  |
Summary of Significant Accounting Policies [Line Items] |  |
Decrease in net cash used for operations and net cash provided by financing activities | $ 26.0 | $ 23.0

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