Financing Arrangements and Debt (Narrative) (Details) $ in Millions	9 Months Ended
	Sep. 30, 2015 USD ($)
Line of Credit Facility [Line Items]
Capital lease duration	25 years
Capital lease payment duration	15 years
Capital lease obligations, current	$ 12.2
Capital lease obligations, noncurrent	213.0
Committed Credit Facility [Member]
Line of Credit Facility [Line Items]
Credit facility maximum borrowing capacity	$ 2,000.0
Credit facility, maturity date	Jun. 01, 2017
Credit facility interest rate above LIBOR	1.25%
Line of credit facility fee	0.25%
Uncommitted Credit Facilities [Member]
Line of Credit Facility [Line Items]
Credit facility maximum borrowing capacity	$ 157.2