Related Party Transactions (Details) (USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Related Party Transactions [Abstract]
Common stock shares sold (in shares)	60,050,777	50,000,000
Treasury Stock acquired (in shares)	23,200,000
Investor Group ownership percentage	12.50%
Financing Arrangements with Related Parties
Outstanding debt with related parties	$ 192.8	$ 189.8