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Derivatives and Hedging Activities - Schedule of Changes in AOCI Associated with Derivative Hedging Activities (Details) - USD ($) $ in Millions | 12 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balances, beginning of period | $ 1,485.9 | $ 1,198.6 | $ 1,104.9
Cumulative adjustment upon adoption of ASU 2017-12 reclassified to reinvested earnings | (1.0) | 0.0 | 0.0
Balances, end of period | 1,520.1 | 1,485.9 | 1,198.6
Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |
Balances, beginning of period | 23.8 | (2.3) | (21.8)
Cumulative adjustment upon adoption of ASU 2017-12 reclassified to reinvested earnings | (1.0) |  |
Current period changes in fair value, net of tax | (32.7) | 26.9 | 5.8
Reclassification to earnings, net of tax | (4.9) | (0.8) | 13.7
Balances, end of period | $ (14.8) | $ 23.8 | $ (2.3)

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