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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Disclosure [Abstract] |  |  |  |
Effective income tax rate | 17.40% | 35.00% | 22.00% | 33.10%
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent | 28.10% |  |  |
Income Tax Expense (Benefit) | $ 98.0 |  |  |
Tax Cuts and Jobs Act of 2017 Incomplete Accounting Provisional Income Tax One Time Benefit, Net | 45.7 |  |  |
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Undistributed Accumulated Earnings of Foreign Subsidiary, Provisional Unrecognized Deferred Tax Liability | 23.1 |  |  |
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Change in Tax Rate, Deferred Tax Liability, Provisional Income Tax (Expense) Benefit | 84.7 |  |  |
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Transition Tax for Accumulated Foreign Earnings, Provisional Income Tax Expense (Benefit) | $ 15.9 |  |  |

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