Condensed Consolidated Statement of Equity - 3 months ended Sep. 30, 2016 - USD ($)
shares in Millions, $ in Millions
Total
Common Stock
Additional Paid-in-Capital
Retained Earnings
Treasury Stock
Accumulated Other Comprehensive Income
Total CDK Stockholders' Equity
Non-controlling Interest
Stockholders' equity, beginning balance at Jun. 30, 2016 $ 376.2 $ 1.6 $ 640.7 $ 238.3 $ (526.6) $ 5.8 $ 359.8 $ 16.4
Common stock, shares issued, beginning balance at Jun. 30, 2016 160.3 160.3            
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net earnings $ 79.2     76.9     76.9 2.3
Foreign currency translation adjustments (4.1)         (4.1) (4.1)  
Stock-based compensation expense and related dividend equivalents 8.2   8.3 (0.1)     8.2  
Common stock issued for the exercise and vesting of stock-based compensation awards, net (9.2)   (26.4)   17.2   (9.2)  
Cash dividends paid to stockholders (20.2)     (20.2)     (20.2)  
Repurchases of common stock 0.0   56.9   (56.9)   0.0  
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders $ (3.0)             (3.0)
Common stock, shares issued, end balance at Sep. 30, 2016 160.3 160.3            
Stockholders' equity, ending balance at Sep. 30, 2016 $ 427.1 $ 1.6 $ 679.5 $ 294.9 $ (566.3) $ 1.7 $ 411.4 $ 15.7