Components of Changes in Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018		Dec. 31, 2017		Dec. 31, 2016
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	$ 2,218.0		$ 1,977.9		$ 2,023.2
Adoption of new accounting pronouncements (Note 1)	(0.6)
Other comprehensive income before reclassifications	(18.4)		15.4		(20.2)
Amounts reclassified to consolidated statement of income	0.0	[1]	14.5	[2],[3]	(0.1)	[2]
Tax benefit (expense)	1.8		(2.5)		2.4
Other comprehensive (loss) income	(16.6)		27.4		(17.9)
Ending Balance	2,453.8		2,218.0		1,977.9
Foreign Currency Adjustments
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(31.6)		(50.0)		(38.5)
Adoption of new accounting pronouncements (Note 1)	(0.3)
Other comprehensive income before reclassifications	(10.6)		20.0		(12.1)
Amounts reclassified to consolidated statement of income	0.0	[1]	0.0	[2],[3]	0.0	[2]
Tax benefit (expense)	0.0		(1.6)		0.6
Other comprehensive (loss) income	(10.6)		18.4		(11.5)
Ending Balance	(42.5)		(31.6)		(50.0)
Defined Benefit Plans
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(0.6)		(13.2)		(11.5)
Adoption of new accounting pronouncements (Note 1)	0.1
Other comprehensive income before reclassifications	1.9		3.3		(2.2)
Amounts reclassified to consolidated statement of income	0.0	[1]	11.9	[2],[3]	0.0	[2]
Tax benefit (expense)	(0.5)		(2.6)		0.5
Other comprehensive (loss) income	1.4		12.6		(1.7)
Ending Balance	0.9		(0.6)		(13.2)
Derivative Agreements
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(4.2)		(0.6)		4.1
Adoption of new accounting pronouncements (Note 1)	(0.4)
Other comprehensive income before reclassifications	(9.7)		(7.9)		(5.9)
Amounts reclassified to consolidated statement of income	0.0	[1]	2.6	[2],[3]	(0.1)	[2]
Tax benefit (expense)	2.3		1.7		1.3
Other comprehensive (loss) income	(7.4)		(3.6)		(4.7)
Ending Balance	(12.0)		(4.2)		(0.6)
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning Balance	(36.4)		(63.8)		(45.9)
Other comprehensive (loss) income	(16.6)		27.4		(17.9)
Ending Balance	$ (53.6)		$ (36.4)		$ (63.8)

[1] (c)Amounts reclassified to cost of sales or interest expense.

[2] Amounts reclassified to cost of sales or selling, general and administrative expenses.

[3] In connection with the termination of international defined benefit pension plans, $11.9 was reclassified to SG&A.  All other amounts were reclassified to Cost of Sales