Schedule II - Valuation and Qualifying Accounts (Details) - Valuation allowance for deferred tax assets [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	$ 65.3	$ 63.6	$ 51.3
Charged to Costs and Expenses	18.8	13.4	11.0
Acquired Obligations	0.0	0.0	6.2
Deductions	(14.1)	(11.7)	(4.9)
Balance at End of Period	$ 70.0	$ 65.3	$ 63.6