Supplemental Cash Flow Information (Narrative) (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Supplemental Cash Flow Elements [Abstract]
Payments of interest and commitment fees	$ 33.4	$ 18.9
Incurred liabilities for fixed and intangible asset additions	42.1	20.8
Other Asset Additions Incurred but Not yet Paid		$ 0.2