Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions |
Sep. 30, 2016 |
Jun. 30, 2016 |
|---|---|---|
| Statement of Financial Position [Abstract] | ||
| Allowance for doubtful accounts | $ 7.4 | $ 7.1 |
| Preferred stock, par value (in usd per share) | $ 0.01 | $ 0.01 |
| Preferred stock, shares authorized | 50,000,000.0 | 50,000,000 |
| Preferred stock, shares issued | 0 | 0 |
| Preferred stock, shares outstanding | 0 | 0 |
| Common stock, par value (in usd per share) | $ 0.01 | $ 0.01 |
| Common stock, shares authorized | 650,000,000.0 | 650,000,000 |
| Common stock, shares issued | 160,300,000 | 160,300,000 |
| Common stock, shares outstanding | 149,500,000 | 150,100,000 |
| Treasury stock shares | 10,800,000 | 10,200,000 |