Supplemental Cash Flow Information (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Supplemental Cash Flow Elements [Abstract]
Payments of interest and commitment fees	$ 49.7	$ 41.5	$ 32.9
Capitalized interest	13.3	3.9	0.1
Income Taxes Paid	0.6
Tax refunds received		(0.3)
Cash paid for income taxes			(0.1)
Incurred liabilities for fixed and intangible asset additions	52.5	14.1	2.0
Other Asset Additions Incurred but Not yet Paid	$ 0.1