Components of Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance		$ (53.6)	$ (36.4)
Adoption of new accounting pronouncement			(0.6)
Other comprehensive income (loss) before reclassifications		(8.6)	3.6
Amounts reclassified to consolidated statement ofincome	[1]	(0.0)	(0.1)
Tax benefit (expense)		2.7	(0.2)
Other comprehensive income (loss)		(5.9)	3.3
Ending balance		(59.5)	(33.7)
Foreign Currency Adjustments
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance		(42.5)	(31.6)
Adoption of new accounting pronouncement			(0.3)
Other comprehensive income (loss) before reclassifications		1.8	3.5
Amounts reclassified to consolidated statement ofincome	[1]	(0.0)	(0.0)
Tax benefit (expense)		(0.0)	(0.0)
Other comprehensive income (loss)		1.8	3.5
Ending balance		(40.7)	(28.4)
Defined Benefit Plans
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance		0.9	(0.6)
Adoption of new accounting pronouncement			0.1
Other comprehensive income (loss) before reclassifications		0.0	0.0
Amounts reclassified to consolidated statement ofincome	[1]	(0.0)	(0.0)
Tax benefit (expense)		(0.0)	(0.0)
Other comprehensive income (loss)		0.0	0.0
Ending balance		0.9	(0.5)
Derivative Agreements
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance		(12.0)	(4.2)
Adoption of new accounting pronouncement			(0.4)
Other comprehensive income (loss) before reclassifications		(10.4)	0.1
Amounts reclassified to consolidated statement ofincome	[1]	(0.0)	(0.1)
Tax benefit (expense)		2.7	(0.2)
Other comprehensive income (loss)		(7.7)	(0.2)
Ending balance		$ (19.7)	$ (4.8)

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