Accounts Receivable, Net of Allowance (Schedule of Activity in Allowance for Doubtful Accounts) (Details) (Continuing Operations [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Continuing Operations [Member]
Allowance for Doubtful Accounts Receivable [Roll Forward]
Allowance for doubtful accounts at beginning of year	$ 11.3	$ 7.7
Provision for doubtful accounts	6.1	6.9
Amounts charged against the allowance	(1.3)	(3.3)
Allowance for doubtful accounts at end of year	$ 16.1	$ 11.3