Recent Accounting Pronouncements (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Jan. 01, 2018	Dec. 31, 2017
Assets
Accounts Receivable	$ 179.3		$ 31.2	$ 178.7
Liabilities
Deferred Revenue	24.2		34.3	$ 12.9
Revenues
Net sales	1,536.5	$ 1,507.1
Operating Costs and Expenses
Cost of materials and other	1,238.3	$ 1,221.2
Balances Without Adoption of ASC 606
Assets
Accounts Receivable	178.6
Liabilities
Deferred Revenue	23.5
Revenues
Net sales	1,536.3
Operating Costs and Expenses
Cost of materials and other	1,238.1
Effect of Change | ASU 2014-09
Assets
Accounts Receivable	0.7		21.4
Liabilities
Deferred Revenue	0.7		$ 21.4
Revenues
Net sales	0.2
Operating Costs and Expenses
Cost of materials and other	$ 0.2