Hedging Activities and Fair Value Measurements, Fair Value Measurements (Details) - Recurring [Member] $ in Millions	Sep. 30, 2017 USD ($)
Financial Assets [Abstract]
Foreign currency forwards	$ 0.8	[1]
Trading securities held in deferred compensation plan	5.3	[2]
Total	6.1
Financial Liabilities [Abstract]
Interest rate swaps	57.7	[3]
Deferred compensation plan	5.3	[2]
Total	63.0
Level 1 [Member]
Financial Assets [Abstract]
Foreign currency forwards	0.0	[1]
Trading securities held in deferred compensation plan	5.3	[2]
Total	5.3
Financial Liabilities [Abstract]
Interest rate swaps	0.0	[3]
Deferred compensation plan	5.3	[2]
Total	5.3
Level 2 [Member]
Financial Assets [Abstract]
Foreign currency forwards	0.8	[1]
Trading securities held in deferred compensation plan	0.0	[2]
Total	0.8
Financial Liabilities [Abstract]
Interest rate swaps	57.7	[3]
Deferred compensation plan	0.0	[2]
Total	57.7
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]
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 September 30, 2017. The present value calculation uses discount rates that have been adjusted to reflect the credit quality of the Company and its counterparties.