| Basis of Presentation  - Tax Cuts and Jobs Act (Details) $ in Millions | 3 Months Ended | 
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| Sep. 30, 2018  USD ($) | |
| Retained Earnings | |
| New Accounting Pronouncements or Change in Accounting Principle [Line Items] | |
| Tax Cuts and Jobs Act of 2017, reclassification from AOCI to Retained Earnings, tax effect | $ 10.7 | 
| AOCI | |
| New Accounting Pronouncements or Change in Accounting Principle [Line Items] | |
| Tax Cuts and Jobs Act of 2017, reclassification from AOCI to Retained Earnings, tax effect | $ (10.7) | 
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