Components of Changes in Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020		Dec. 31, 2019		Dec. 31, 2018
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance	$ (66.7)		$ (53.6)		$ (36.4)
Other comprehensive income (loss) before reclassifications	(24.4)		(27.7)		(18.4)
Amounts reclassified to consolidated statement of income	5.8	[1]	8.0	[1]	(0.0)	[2]
Tax benefit (expense)	7.7		6.6		1.8
Other comprehensive income (loss)	(10.9)		(13.1)		(16.6)
Ending balance	(77.6)		(66.7)		(53.6)
Cumulative Effect, Period of Adoption, Adjusted Balance
Accumulated Other Comprehensive Income Loss [Line Items]
Adoption of new accounting pronouncements (Note 1)					(0.6)
Foreign Currency Adjustments
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance	(36.8)		(42.5)		(31.6)
Other comprehensive income (loss) before reclassifications	10.4		3.8		(10.6)
Amounts reclassified to consolidated statement of income	(0.0)	[1]	1.9	[1]	(0.0)	[2]
Tax benefit (expense)	(0.0)		(0.0)		(0.0)
Other comprehensive income (loss)	10.4		5.7		(10.6)
Ending balance	(26.4)		(36.8)		(42.5)
Foreign Currency Adjustments | Cumulative Effect, Period of Adoption, Adjusted Balance
Accumulated Other Comprehensive Income Loss [Line Items]
Adoption of new accounting pronouncements (Note 1)					(0.3)
Defined Benefit Plans
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance	0.0		0.9		(0.6)
Other comprehensive income (loss) before reclassifications	0.0		(1.3)		1.9
Amounts reclassified to consolidated statement of income	(0.0)	[1]	(0.0)	[1]	(0.0)	[2]
Tax benefit (expense)	(0.0)		0.4		(0.5)
Other comprehensive income (loss)	0.0		(0.9)		1.4
Ending balance	0.0		0.0		0.9
Defined Benefit Plans | Cumulative Effect, Period of Adoption, Adjusted Balance
Accumulated Other Comprehensive Income Loss [Line Items]
Adoption of new accounting pronouncements (Note 1)					0.1
Derivative Agreements
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance	(29.9)		(12.0)		(4.2)
Other comprehensive income (loss) before reclassifications	(34.8)		(30.2)		(9.7)
Amounts reclassified to consolidated statement of income	5.8	[1]	6.1	[1]	(0.0)	[2]
Tax benefit (expense)	7.7		6.2		2.3
Other comprehensive income (loss)	(21.3)		(17.9)		(7.4)
Ending balance	$ (51.2)		$ (29.9)		(12.0)
Derivative Agreements | Cumulative Effect, Period of Adoption, Adjusted Balance
Accumulated Other Comprehensive Income Loss [Line Items]
Adoption of new accounting pronouncements (Note 1)					$ (0.4)

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

[2] Amounts reclassified to cost of sales or interest expense.