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Income Taxes - Income Tax Provision Attributable to Controlling and Non-Controlling Interests (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income tax provision      
Current tax $ 182.0 $ 176.3 $ 162.2
Deferred taxes (123.6) 59.3 101.2
Provision for income taxes $ 58.4 $ 235.6 $ 263.4
Effective tax rate attributable to controlling interests 6.80% 32.60% 33.60%
Controlling interests      
Income tax provision      
Current tax $ 173.8 $ 168.1 $ 152.4
Intangible-related deferred taxes (98.5) 84.3 77.7
Other deferred taxes (24.9) (23.2) 27.7
Provision for income taxes 50.4 229.2 257.8
Income before income taxes (controlling interest) $ 739.9 $ 702.0 $ 767.3
Effective tax rate attributable to controlling interests [1] 6.80% 32.60% 33.60%
Non-Controlling Interests      
Income tax provision      
Current tax $ 8.2 $ 8.2 $ 9.8
Deferred taxes (0.2) (1.8) (4.2)
Provision for income taxes $ 8.0 $ 6.4 $ 5.6
[1] Taxes attributable to the controlling interest divided by Income before income taxes (controlling interest).