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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Statement of Comprehensive Income [Abstract]        
Tax on unrealized gain on available for sale securities $ 0.0 $ 0.0 $ 0.2 $ 12.6
Tax on net gain reclassified into income on sale of available-for-sale securities (0.2) 0.0 (0.2) (8.0)
Tax on net gain reclassified into income on reclassification of available-for-sale securities to trading securities 0.0 0.0 0.0 (4.6)
Tax on change in fair value of interest rate swaps 0.0 0.0 0.0 0.0
Tax on net loss reclassified into income on settlement of interest rate swaps $ 0.0 $ 0.1 $ 0.0 $ 0.2