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Income taxes - Income and Taxes from Cont. Operations (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Income (loss) from continuing operations before income taxes [Abstract]    
Income from continuing operations before tax $ (78.6) $ 12.0
Income tax expense (benefit) from continuing operations [Abstract]    
Deferred income taxes (15.8) (12.8)
Provision (benefit) for income taxes 9.0 5.4
Comprehensive provision (benefit) for income taxes allocation [Abstract]    
Provision Continuing Operations 9.0 5.4
Discontinued operations 1.0 (0.4)
Other comprehensive income (loss) $ (3.7) $ (6.5)