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Consolidated Statements of Shareholders' Equity (Parenthetical) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement of Stockholders' Equity [Abstract]      
Issuance of common stock related to share-based payment awards, income tax benefit $ 0.0 $ 1.6 $ 0.0
Previous percentage ownership of noncontrolling owners   49.00%