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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Statement of Comprehensive Income [Abstract]        
Unrealized gain on available-for-sale securities, tax $ 0.0 $ 0.0 $ 0.0 $ 0.2
Net gain reclassified into income on sale of available-for-sale securities, tax 0.0 (0.2) 0.0 (0.2)
Change in fair value of interest rate swaps, tax $ 0.0 $ 0.0 $ 0.0 $ 0.0