Fair Value Measurements - Schedule of Fair Values of Financial Liabilities (Details) (USD $) In Millions, unless otherwise specified	Oct. 31, 2009	Dec. 31, 2013 Level 1	Dec. 31, 2012 Level 1	Dec. 31, 2013 Level 2	Dec. 31, 2012 Level 2	Dec. 31, 2013 Level 3	Dec. 31, 2012 Level 3	Dec. 31, 2013 Total	Dec. 31, 2012 Total	Dec. 31, 2013 Carrying Value	Dec. 31, 2012 Carrying Value
Liabilities:
Long-term debt, including current portion		$ 0	$ 0	$ 1,931.9	$ 1,196.7	$ 0	$ 0	$ 1,931.9	$ 1,196.7	$ 1,927.7	$ 1,167.3
Preferred Stock	47.9		0		49.2		0		49.2		48.4
Total liabilities at fair value			$ 0		$ 1,245.9		$ 0		$ 1,245.9		$ 1,215.7