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Fair Value Measurements (Changes in Level 3 Assets) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Total Gains (Losses):        
Included in Earnings $ 0.0 $ 0.7 $ 0.0 $ 0.7
Auction Rate        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Fair value assets beginning balance 16.6 98.8 18.1 98.9
Total Gains (Losses):        
Included in Other Comprehensive Income (0.4) 0.1 (0.2) 0.4
Purchases, Issues, Sales, and Settlements        
Sales 0.0 (14.4) (1.2) (14.4)
Settlements 0.0 0.0 (0.5) (0.4)
Fair value assets ending balance $ 16.2 $ 85.2 $ 16.2 $ 85.2