Debt and Financing Arrangements (Interest rate derivatives) (Details) $ in Millions	Jun. 30, 2018 USD ($)
Interest rate swap, effective 2018
Debt Instrument [Line Items]
Notional Amount	$ 250.0
Fixed Rate	1.662%
Interest rate swap, effective 2019
Debt Instrument [Line Items]
Notional Amount	$ 200.0
Fixed Rate	1.952%
Interest rate swap, effective 2020
Debt Instrument [Line Items]
Notional Amount	$ 100.0
Fixed Rate	2.182%