Goodwill (Details) $ in Millions	3 Months Ended
	Mar. 31, 2019 USD ($)
Change in the carrying amount of goodwill
Balance at the beginning of the period	$ 1,870.8
Purchase price allocation adjustments	(0.5)
Foreign currency translation gain	1.4
Balance at the end of the period	1,871.7
Accumulated impairment losses	$ 0.0