Annual report pursuant to Section 13 and 15(d)

Consolidated Statements of Changes in Shareholders' (Deficit) Equity (Parenthetical)

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Consolidated Statements of Changes in Shareholders' (Deficit) Equity (Parenthetical) - USD ($)
shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement Of Stockholders Equity [Abstract]      
Issuance of common shares 6.3 3.8 1.2
Repurchases of common shares 14.3 25.4 0.4
Foreign currency translation adjustment, tax $ (2.7) $ 5.7 $ 5.2
Unrealized loss on derivatives, tax     (0.3)
Other, tax     $ 0.1
Forward Counterparties' delivery of common shares to the Company 13.9