Defined Benefit Pension Plans (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018		Jun. 30, 2017	Dec. 31, 2018
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	$ 1.1	$ 1.4	$ 2.2		$ 2.7
Interest cost	2.9	3.3	5.8		6.5
Expected return on plan assets	(3.3)	(3.3)	(6.7)		(6.5)
Amortization of prior service cost 1	0.1	0.2	0.2	[1]	0.4
Amortization of net loss 1	1.5	1.4	3.1	[1]	2.8
Net periodic pension cost	2.3	3.0	4.6		5.9
Net periodic pension cost included in cost of sales	0.6	0.9	1.3		1.7
Net periodic pension cost included in selling, general, and administrative expenses	0.5	0.5	0.9		1.0
Net periodic pension cost included in other non-operating items	$ 1.2	$ 1.6	2.4		$ 3.2
Pension Contributions			$ 5.0
Scenario, Forecast [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year						$ 40.0

[1] The amounts reclassified from accumulated other comprehensive income (loss) are included in the computation of net periodic pension cost; see Note 17 for additional details. The net periodic pension cost is included in the captions "Cost of sales", "Selling, general and administrative expenses" and "Other non-operating items" in the Consolidated Statements of Income.