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New Accounting Pronouncements (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Jan. 01, 2017
New Accounting Pronouncements |  |  |  |  |
Income tax expense (benefit) | $ 78.1 | $ 83.4 | $ 212.7 | $ 222.6 |
Impact of ASU 2016-09 |  |  |  |  |
New Accounting Pronouncements |  |  |  |  |
Income tax expense (benefit) | $ (16.6) |  | $ (45.8) |  |
Increase in diluted earnings per share (in dollars per share) | $ 0.05 |  | $ 0.14 |  |
Cumulative-effect adjustment to retained earnings |  |  |  |  | $ 0.0

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