Condensed Consolidating Financial Data (Condensed Consolidating Balance Sheets) (Details) (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010
Current assets	$ 3,516.4	$ 3,370.8
Investment in subsidiaries
Non-current assets	3,672.7	3,722.2
Total assets	7,189.1	7,093.0
Current liabilities	1,474.0	1,677.2
Non-current liabilities	3,803.6	3,595.3
Stockholders' equity	1,911.5	1,820.5
Total liabilities and stockholders' equity	7,189.1	7,093.0
Parent [Member]
Current assets	122.5	314.6
Investment in subsidiaries	5,768.4	5,340.3
Non-current assets	148.7	153.7
Total assets	6,039.6	5,808.6
Current liabilities	246.0	217.4
Non-current liabilities	3,882.1	3,770.7
Stockholders' equity	1,911.5	1,820.5
Total liabilities and stockholders' equity	6,039.6	5,808.6
Guarantor Subsidiaries [Member]
Current assets	1,141.1	998.6
Investment in subsidiaries	1,772.8	1,739.8
Non-current assets	3,929.9	3,768.8
Total assets	6,843.8	6,507.2
Current liabilities	642.4	588.5
Non-current liabilities	472.9	504.3
Stockholders' equity	5,728.5	5,414.4
Total liabilities and stockholders' equity	6,843.8	6,507.2
Non-Guarantor Subsidiaries [Member]
Current assets	2,262.9	2,067.6
Investment in subsidiaries		93.4
Non-current assets	930.8	1,015.1
Total assets	3,193.7	3,176.1
Current liabilities	591.8	878.0
Non-current liabilities	789.2	539.0
Stockholders' equity	1,812.7	1,759.1
Total liabilities and stockholders' equity	3,193.7	3,176.1
Eliminations [Member]
Current assets	(10.1)	(10.0)
Investment in subsidiaries	(7,541.2)	(7,173.5)
Non-current assets	(1,336.7)	(1,215.4)
Total assets	(8,888.0)	(8,398.9)
Current liabilities	(6.2)	(6.7)
Non-current liabilities	(1,340.6)	(1,218.7)
Stockholders' equity	(7,541.2)	(7,173.5)
Total liabilities and stockholders' equity	$ (8,888.0)	$ (8,398.9)