Accumulated Other Comprehensive Income (Reclassifications Out of Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Cost of products sold		$ (336.4)	$ (321.2)	$ (614.7)	$ (570.1)
Income tax (expense) benefit		(18.3)	(14.6)	(14.0)	(11.1)
Amount Reclassified from Accumulated Other Comprehensive Income
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Net of tax		(2.4)	(0.5)	(4.5)	(0.7)
Unrecognized Pension and Other Post-retirement Benefit Costs | Amount Reclassified from Accumulated Other Comprehensive Income
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Amortization of actuarial loss included in net income	[1]	(1.5)	(1.2)	(2.9)	(2.3)
Amortization of prior service cost	[1]	(0.1)	(0.1)	(0.2)	(0.2)
Total before tax		(1.6)	(1.3)	(3.1)	(2.5)
Income tax (expense) benefit		0.4	0.5	0.7	0.8
Net of tax		(1.2)	(0.8)	(2.4)	(1.7)
Foreign exchange contracts | Derivative Financial Instruments | Amount Reclassified from Accumulated Other Comprehensive Income
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Cost of products sold		(1.7)	0.5	(2.9)	1.6
Income tax (expense) benefit		0.5	(0.2)	0.8	(0.6)
Net of tax		$ (1.2)	$ 0.3	$ (2.1)	$ 1.0

[1] These accumulated other comprehensive income components are included in the computation of net periodic benefit cost for pension and post-retirement plans. See "Note 6. Pension and Other Retiree Benefits" for additional details.