Description of the Business and Summary of Significant Accounting Policies - Income Taxes (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Operating Loss Carryforwards [Line Items]
Valuation allowance	$ 107.3	$ 178.7
Deferred tax liabilities, deferred expense	(71.4)	(62.5)
U.S. Federal
Operating Loss Carryforwards [Line Items]
Valuation allowance	58.1	126.7
Bally Acquisition
Operating Loss Carryforwards [Line Items]
Deferred tax liabilities, deferred expense	$ 79.1