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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Parenthetical) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Statement of Comprehensive Income [Abstract]        
Unrealized gain on available-for-sale securities, tax $ 0 $ 0.9 $ 0 $ 0.9
Change in fair value of interest rate swap, tax 0 0.1 (0.1) 0.1
Net loss reclassified into income on settlement of interest rate swap, tax $ 0.1 $ 0.1 $ 0.1 $ 0.2