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Basis of Presentation Basis of Presentation (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
New Accounting Pronouncement, Early Adoption [Line Items] |  |
Income tax excess tax benefit adjustment - ASU 2016-09 Adoption | $ 8.3 | $ 2.3
Employee Service Share-based Compensation, Tax Benefit Realized from Exercise of Stock Options |  | $ 2.5
Basic (in dollars per share) | $ 3.03 | $ 1.13
Diluted (in dollars per share) | $ 2.86 | 1.08
EPS [Member] |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |
Basic (in dollars per share) |  | 0.99
Diluted (in dollars per share) |  | $ 0.96
Adjustments for New Accounting Pronouncement [Member] |  |
New Accounting Pronouncement, Early Adoption [Line Items] |  |
Weighted Average Number Diluted Shares Outstanding Adjustment |  | 314,000

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