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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Parenthetical) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2021 | Mar. 31, 2020
Statement of Comprehensive Income [Abstract] |  |  |  |
Pension and post-retirement benefits, tax expense | $ (31.5) | $ (0.9) | $ (33.8) | $ (3.1)
Net gain on derivative instruments, tax benefit (expense) | $ (0.5) | $ 2.8 | $ (4.7) | $ 0.4

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