Hedging Activities and Fair Value Measurements, Fair Value Measurements (Details) - Recurring [Member] $ in Millions	Jun. 30, 2018 USD ($)
Financial Assets [Abstract]
Foreign currency forwards	$ 0.2	[1]
Trading securities held in deferred compensation plan	5.9	[2]
Total	6.1
Financial Liabilities [Abstract]
Foreign currency forwards	0.5	[1]
Interest rate swaps	25.5	[3]
Deferred compensation plan	5.9	[2]
Total	31.9
Level 1 [Member]
Financial Assets [Abstract]
Foreign currency forwards	0.0	[1]
Trading securities held in deferred compensation plan	5.9	[2]
Total	5.9
Financial Liabilities [Abstract]
Foreign currency forwards	0.0	[1]
Interest rate swaps	0.0	[3]
Deferred compensation plan	5.9	[2]
Total	5.9
Level 2 [Member]
Financial Assets [Abstract]
Foreign currency forwards	0.2	[1]
Trading securities held in deferred compensation plan	0.0	[2]
Total	0.2
Financial Liabilities [Abstract]
Foreign currency forwards	0.5	[1]
Interest rate swaps	25.5	[3]
Deferred compensation plan	0.0	[2]
Total	26.0
Level 3 [Member]
Financial Assets [Abstract]
Foreign currency forwards	0.0	[1]
Trading securities held in deferred compensation plan	0.0	[2]
Total	0.0
Financial Liabilities [Abstract]
Foreign currency forwards	0.0	[1]
Interest rate swaps	0.0	[3]
Deferred compensation plan	0.0	[2]
Total	$ 0.0

[1] Based on calculations that use readily observable market parameters as their basis, such as spot and forward rates.

[2] Based on the quoted price of publicly traded mutual funds which are classified as trading securities and accounted for using the mark-to-market method.

[3] Measured as the present value of all expected future cash flows based on the LIBOR-based swap yield curves as of June 30, 2018. The present value calculation uses discount rates that have been adjusted to reflect the credit quality of the Company and its counterparties.