New Accounting Pronouncements (Summary of Reclassification of Expenses Due to Adoption of New Accounting Pronouncements) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Reclassification of expense to Cost of sales	$ 359.1	$ 291.1	$ 699.7	$ 579.9
Reclassification of income to Other components of pension income and other postretirement benefits expense, net	$ (2.1)	(1.5)	$ (4.4)	(3.1)
Accounting Standards Update 2017-07
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Reclassification of expense to Cost of sales		0.5		1.0
Reclassification of income to Other components of pension income and other postretirement benefits expense, net		$ (1.5)		$ (3.1)