Earnings Per Share - Computation of Diluted EPS (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions |
3 Months Ended | 12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Jun. 30, 2015 |
Mar. 31, 2015 |
Dec. 31, 2014 |
Sep. 30, 2014 |
Jun. 30, 2014 |
Mar. 31, 2014 |
Dec. 31, 2013 |
Sep. 30, 2013 |
Jun. 30, 2015 |
Jun. 30, 2014 |
Jun. 30, 2013 |
|
| Earnings Per Share [Abstract] | |||||||||||
| Net earnings | $ 165.9 | $ 54.0 | $ 34.7 | $ 32.5 | $ 140.2 | $ 50.8 | $ 27.6 | $ 44.4 | $ 287.1 | $ 263.0 | $ 212.1 |
| Diluted Weighted-average shares outstanding | 124.0 | 124.1 | 125.4 | ||||||||
| Diluted EPS (in usd per share) | $ 1.35 | $ 0.43 | $ 0.28 | $ 0.26 | $ 1.13 | $ 0.41 | $ 0.22 | $ 0.36 | $ 2.32 | $ 2.12 | $ 1.69 |