XML 58 R47.htm IDEA: XBRL DOCUMENT v3.4.0.3
Fair Value Measurements (Changes in Level 3 Assets) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Total Gains (Losses):    
Included in Earnings $ 0.0 $ 0.0
Auction Rate    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value assets beginning balance 17.1 18.1
Total Gains (Losses):    
Included in Other Comprehensive Income (0.4) (0.3)
Purchases, Issues, Sales, and Settlements    
Sales (0.1) 0.0
Settlements 0.0 (0.3)
Fair value assets ending balance $ 16.6 $ 17.5