Schedule II Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Allowance for Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Valuation Allowances and Reserves, Balance	$ 5.4	$ 9.6	$ 6.5
Valuation Allowances and Reserves, Charged to Cost and Expense	(0.6)	(0.2)	4.3
Valuation Allowances and Reserves, Deductions	0.0	(3.1)	(0.6)
Valuation Allowances and Reserves, Adjustments	(0.4)	(0.9)	(0.6)
Valuation Allowances and Reserves, Balance	4.4	5.4	9.6
Valuation Allowance of Deferred Tax Assets [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Valuation Allowances and Reserves, Balance	14.8	7.7	7.3
Valuation Allowances and Reserves, Charged to Cost and Expense	36.0	9.3	1.8
Valuation Allowances and Reserves, Adjustments	(13.2)	(2.2)	(1.4)
Valuation Allowances and Reserves, Balance	$ 37.6	$ 14.8	$ 7.7