2014 Financing Transactions (Non-cash Activity) (Details) (USD $) In Millions, unless otherwise specified					12 Months Ended				0 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 A&R CDA [Member]	Dec. 31, 2012 A&R CDA [Member]	Dec. 31, 2013 Senior Notes [Member] Senior B Notes [Domain]	Dec. 31, 2012 Senior Notes [Member] Senior B Notes [Domain]	Feb. 13, 2014 Subsequent Event [Member] Secured CDA [Domain]	Dec. 31, 2013 Subsequent Event [Member] A&R CDA [Member]	Feb. 13, 2014 Subsequent Event [Member] Senior Notes [Member] Unsecured CDA [Domain]	Feb. 13, 2014 Subsequent Event [Member] Senior Notes [Member] Senior B Notes [Domain]	Feb. 13, 2014 Subsequent Event [Member] 2014 Financing [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 1,363.4	$ 1,375.4	$ 124.0	$ 125.4	$ 58.7	$ 66.1	$ 51.0	$ 124.0	$ 73.0
Aggregate principal converted					29.1				50.6	50.6
Sources of Funds											174.6
Non Cash Uses of Funds											$ 174.6