Schedule II (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Allowances for Doubtful Accounts
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	$ 6.5	$ 9.6	$ 6.5	$ 7.6
Provisions for bad debts/valuation allowance	0.6	(0.2)	4.3
Bad debts written off	(0.2)	(3.1)	(0.6)
Release of valuation allowance/ other	(1.5)	(0.9)	(0.6)
Balance at end of period		5.4	9.6	6.5
Valuation Allowance on Deferred Tax Assets
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period	$ 7.3	7.7	7.3	6.1
Provisions for bad debts/valuation allowance		9.3	1.8	3.8
Release of valuation allowance/ other		(2.2)	(1.4)	(2.6)
Balance at end of period		$ 14.8	$ 7.7	$ 7.3