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Income Tax Reform - Summary of Tax Cuts and Jobs Act of 2017 Effects (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended | 9 Months Ended
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Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2018
Income Tax Disclosure [Abstract] |  |  |
Reduction in net deferred tax liabilities in the U.S. from the reduction of the U.S. tax rate | $ 0.8 | $ 180.3 | $ 181.1
Establishment of valuation allowances related to deferred tax assets impacted by TCJA | 0.0 | (7.6) | (7.6)
Toll-tax on un-repatriated earnings | 0.0 | (1.4) | (1.4)
Total discrete deferred income tax adjustments | $ 0.8 | $ 171.3 | $ 172.1
Basic earnings per share (USD per share) | $ 0.00 | $ 0.99 | $ 0.99
Diluted earnings per share (USD per share) | $ 0.00 | $ 0.97 | $ 0.97

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