Financing and Other Activities Financing and Other Activities (Narrative) (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Other Commitments [Line Items]
Debt Instrument, Maturity Date	Sep. 01, 2039
Debt Instrument, Face Amount	$ 100.0
Debt Instrument, Interest Rate, Stated Percentage	4.09%
Noncash or Part Noncash Acquisition, Value of Liabilities Assumed		134.8
Noncash or Part Noncash Acquisition, Value of Assets Acquired		147.3
Payments to Acquire Businesses, Gross		12.5
Credit Facility 850 Million [Member]
Other Commitments [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 850.0