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Summary of Significant Accounting Policies, Recent Accounting Pronouncements (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Jan. 01, 2017
New Accounting Pronouncements |  |  |  |  |  |  |  |
Income tax expense (benefit) |  |  |  |  | $ 691.7 | $ 308.5 | $ 280.5 |
Impact of ASU 2016-09 |  |  |  |  |  |  |  |
New Accounting Pronouncements |  |  |  |  |  |  |  |
Income tax expense (benefit) | $ (20.8) | $ (16.6) | $ (21.2) | $ (8.0) | $ (66.6) |  |  |
Increase in diluted earnings per share (in dollars per share) |  |  |  |  | $ 0.21 |  |  |
Cumulative-effect adjustment to retained earnings |  |  |  |  |  |  |  | $ 0.0

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