Income Taxes (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		6 Months Ended
	Oct. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Jun. 30, 2017
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Income tax (benefit) expense		$ (58.4)	$ 1.3	$ (46.6)	$ 2.2
Income tax expense as a percent of pre-tax income (loss)		(173.30%)	15.70%	(67.60%)	73.30%
Tax Cuts and Jobs Act of 2017, income tax benefit		$ 66.0
Tax Cuts and Jobs Act of 2017, tax benefit of deferred tax assets and liabilities re-measurement		73.3
Tax Cuts and Jobs Act of 2017, tax expense for transition tax		5.1
Net tax benefit associated with research and development			$ 0.9
Net tax benefit associated with research and development			$ 0.3
Discrete tax tax charge				$ 2.1
Indefinitely reinvested foreign earnings						$ 99.1
General Retirement Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Discretionary contribution	$ 100.0
State and Local Jurisdiction
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Income tax (benefit) expense		$ 2.2