Derivative Financial Instruments (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Derivative [Line Items]
Liability contracts collateral	$ 0.0	$ 0.0
Assets contracts collateral	$ 0.0	0.0
Total derivative contracts, maturity year	2017
Gain (Loss) On Discontinuation Of Cash Flow Hedge Due To Forecasted Transaction Probable Of Not Occurring, Net	$ (11.9)	0.9	$ 0.1
Cash Flow Hedges Of Forecasted Transactions, Net Of Tax, In Accumulated OCI Gain (Loss)	(87.1)	$ (77.3)
Cash Flow Hedge Gain (Loss) Expected To Be Reclassified Within 12 Months	$ (66.9)