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Basis of Presentation (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	$ 2,537.6	$ 2,165.2	$ 4,545.1	$ 3,792.8
Assets	8,024.1		8,024.1		$ 7,971.7
Cumulative effect of new accounting principle in period of adoption	0.4		0.4
Retained Earnings [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of new accounting principle in period of adoption	0.4		0.4
Accounting Standards Update 2017-07
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Net Income	0.1
Wholly Owned Subsidiary in Argentina [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue from Contract with Customer, Including Assessed Tax			49.2
Assets	$ 118.8		$ 118.8