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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement of Comprehensive Income [Abstract]      
Unrealized gain (loss) on available-for-sale securities, tax $ 0.0 $ 0.2 $ 12.6
Net gain reclassified into income on sale of available-for-sale-securities, tax 0.0 (0.2) (8.0)
Net gain reclassified into income on reclassification of available-for-sale securities to trading securities, tax 0.0 0.0 (4.6)
Change in fair value of interest rate swap, tax 0.0 0.0 0.0
Net loss reclassified into income on settlement of interest rate swap, tax $ 0.0 $ 0.0 $ 0.2