Allowance for Credit Losses Valuation and Qualifying Accounts (Details) - Allowance for Doubtful Accounts, Current [Member] - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Valuation and Qualifying Accounts Disclosure [Line Items]
Valuation Allowances and Reserves, Additions for Charges to Cost and Expense		$ 54.9	$ 22.9	$ 15.8
Valuation Allowances and Reserves, Additions for Charges to Other Accounts	[1]	1.4	1.7	(4.0)
Valuation Allowances and Reserves, Deductions	[2]	(35.0)	(5.9)	(1.0)
Valuation Allowances and Reserves, Balance		$ 71.7	$ 50.4	$ 31.7	$ 20.9

[1] (1) Net effects of foreign currency translation.

[2] (2) Uncollectible accounts written-off, net of recoveries.