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Income Taxes (Income Before Income Taxes) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]      
U.S. operations $ (4.0) $ 57.5 $ 28.9
International operations 120.1 111.5 118.2
Income before income taxes $ 116.1 $ 169.0 $ 147.1