Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Allowance for Doubtful Accounts [Member]
Valuation and Qualifying Accounts
Balance at Beginning of Period	$ 5.3	$ 8.1	$ 5.3	$ 5.9
Charged to Expense		4.2	14.5	12.2
Charged to Other Accounts	3.5	0.0		0.0
Deductions		(7.0)	(15.2)	(12.8)
Balance at End of Period		5.3	8.1	5.3
Deferred Tax Asset Valuation Allowance [Member]
Valuation and Qualifying Accounts
Balance at Beginning of Period	21.2	39.3	21.2	19.7
Charged to Expense		3.1	10.2	6.0
Charged to Other Accounts	$ 10.3	0.0		0.0
Deductions		(6.2)	(2.4)	(4.5)
Balance at End of Period		$ 36.2	$ 39.3	$ 21.2