Financial Instruments and Fair Value Measurements (Details) - USD ($) $ in Millions		12 Months Ended
		Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, including current portion	[1]		$ 1,687.0	$ 1,687.1
Other financing arrangments			5.2	0.0
Estimate of Fair Value, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, including current portion	[1]		1,607.7	1,687.5
Other financing arrangments			5.3	0.0
Interest Rate Contract [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative, Notional Amount			$ 300.0
Derivative, Fixed Interest Rate			2.938%
Interest Rate Swap, Carrying Value			$ 1.9	0.0
Interest Rate Contract [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest Rate Swap, Fair Value			1.9	$ 0.0
Fair Value, Inputs, Level 1 [Member] | Interest Rate Contract [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest Rate Swap, Fair Value			0.0
Fair Value, Inputs, Level 2 [Member] | Interest Rate Contract [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest Rate Swap, Fair Value			1.9
Fair Value, Inputs, Level 3 [Member] | Interest Rate Contract [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest Rate Swap, Fair Value			$ 0.0
Scenario, Forecast [Member] | Interest Rate Contract [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash Flow Hedge Loss (Gain) to be Reclassified within Twelve Months		$ 1.6

[1] Excludes capital leases and note issuance costs.