Changes in Stockholders' Equity (Reclassifications out of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Cost of goods sold	$ 1,477.8	$ 1,539.1
Reclassification before tax	(84.5)	(74.3)
Income tax provision	29.4	19.4
Reclassification net of tax	(64.7)	(65.1)
Net losses reclassified from accumulated other comprehensive loss into income	3.4	3.6
Deferred Net Gains (Losses) on Derivatives
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Net losses reclassified from accumulated other comprehensive loss into income	(0.1)
Income tax provision	0.0
Net losses reclassified from accumulated other comprehensive loss into income	(0.1)
Amortization of net actuarial losses
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Net losses reclassified from accumulated other comprehensive loss into income	3.5	3.1
Income tax provision	(0.5)
Net losses reclassified from accumulated other comprehensive loss into income	3.0
Amortization of prior service cost
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Net losses reclassified from accumulated other comprehensive loss into income	0.5	0.4
Income tax provision	0.0
Net losses reclassified from accumulated other comprehensive loss into income	0.5
Defined Benefit Pension Plans
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Net losses reclassified from accumulated other comprehensive loss into income	4.0	3.5
Income tax provision	(0.5)	(0.5)
Net losses reclassified from accumulated other comprehensive loss into income	3.5	3.0
Reclassification out of Accumulated Other Comprehensive Income | Deferred Net Gains (Losses) on Derivatives
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Reclassification before tax	(0.1)	0.6
Income tax provision	0.0	0.0
Reclassification net of tax	(0.1)	0.6
Foreign currency contracts | Reclassification out of Accumulated Other Comprehensive Income | Deferred Net Gains (Losses) on Derivatives
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Cost of goods sold	$ (0.1)	$ 0.6