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Condensed Consolidated Statements of Stockholders' Equity (Parenthetical) - USD ($) $ in Millions |  | 3 Months Ended |  |
--- | --- | --- | --- | ---
Feb. 14, 2018 | Mar. 31, 2018 | Mar. 31, 2017 | Jan. 01, 2018 | Dec. 31, 2017
Statement of Stockholders' Equity [Abstract] |  |  |  |  |
Dividends per share common stock (in dollars per share) | $ 0.16 | $ 0.16 | $ 0.16 |  |
Reduction to retained earnings |  | $ (1,502.9) |  |  | $ (1,735.2)
ASU 2016-16 |  |  |  |  |
Reduction to retained earnings |  |  |  | $ 2.7 |
ASU 2014-09 |  |  |  |  |
Reduction to retained earnings |  |  |  | $ 2.4 |

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