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Income Taxes, Income Before Taxes, Domestic and International (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income before taxes from domestic and international sources [Abstract]      
Domestic $ 54.8 $ 57.2 $ 132.1
International 470.3 385.2 447.0
Income before income taxes and noncontrolling interest $ 525.1 $ 442.4 $ 579.1