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, 2015
Dec. 31, 2014
Dec. 31, 2013
Statement Of Stockholders Equity [Abstract]      
Issuance of common shares 1.0 1.4 0.4
Repurchases of common shares 0.4 20.2 6.2
Dividends declared per share   $ 0.30 $ 1.20
Foreign currency translation adjustment, tax $ (7.2) $ (7.3) $ (4.3)
Unrealized gain (loss) on derivatives, tax (0.6) 0.6 1.7
Unrealized gain on available-for-sale investments, tax $ (0.1) $ 0.1 $ 0.1