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Earnings per Share - Components of Basic and Diluted Earnings Per Share (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
|
Mar. 31, 2015
|
Mar. 31, 2014
|
Mar. 31, 2015
|
Mar. 31, 2014
|
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| Weighted-average shares outstanding: | ||||
| Net earnings attributable to CDK | $ 56.3 | $ 69.6 | $ 137.7 | $ 176.0 |
| Basic (shares) | 160.6 | 160.6 | 160.7 | 160.6 |
| Effect of employee stock options (shares) | 0.7 | 0 | 0.4 | 0 |
| Effect of employee restricted stock (shares) | 0.6 | 0 | 0.4 | 0 |
| Diluted (shares) | 161.9 | 160.6 | 161.5 | 160.6 |
| Basic earnings per share (usd per share) | $ 0.35 | $ 0.43 | $ 0.86 | $ 1.10 |
| Diluted earnings per share (usd per share) | $ 0.35 | $ 0.43 | $ 0.85 | $ 1.10 |