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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Statement of Comprehensive Income [Abstract]        
Unrealized gain on available-for-sale securities, tax $ 0.0 $ 0.0 $ 12.6 $ 0.0
Net gain reclassified into income on sale of AFS securities, tax 0.0 0.0 (8.0) 0.0
Net gain reclassified into income on reclassification of available-for-sale securities to trading securities, tax 0.0 0.0 (4.6) 0.0
Change in fair value of interest rate swap, tax 0.0 0.0 0.0 (0.1)
Net loss reclassified into income on settlement of interest rate swap, tax $ 0.1 $ 0.1 $ 0.1 $ 0.1