Fair Value Measurements (Details 1) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011	Oct. 31, 2009
Schedule of Fair Values of Financial Liabilities
Long-term debt, including current portion	$ 1,196.7
Fair Value of Redeemable Preferred Stock	49.9		47.9
Total liabilities at fair value	1,246.6	1,240.6
Level 1 [Member]
Schedule of Fair Values of Financial Liabilities
Long-term debt, including current portion
Fair Value of Redeemable Preferred Stock
Total liabilities at fair value
Level 2 [Member]
Schedule of Fair Values of Financial Liabilities
Long-term debt, including current portion	1,196.7
Fair Value of Redeemable Preferred Stock	49.7
Total liabilities at fair value	1,246.4
Level 3 [Member]
Schedule of Fair Values of Financial Liabilities
Long-term debt, including current portion
Fair Value of Redeemable Preferred Stock	0.2
Total liabilities at fair value	$ 0.2