Unconsolidated Affiliates (Details 1) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Statement Data:
Total revenues	$ 1,053.4	$ 908.1	$ 899.3
Costs and expenses	1,008.1	846.1	863.4
Net income	45.4	62.0	35.9
Balance Sheet Data:
Current assets	461.0	816.5
Noncurrent assets	661.3	772.8
Current liabilities	203.3	392.9
Noncurrent liabilities	419.0	468.9
Partners' and stockholders' equity	$ 500.0	$ 727.5