Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Earnings:
Net income from continuing operations	$ 133.0		$ 25.8		$ 198.8	$ (43.6)
Net income (loss) from discontinued operations, net of income taxes	18.6		(154.2)		24.3	(121.1)
Net income (loss)	$ 151.6	$ 71.5	$ (128.4)	$ (36.3)	$ 223.1	$ (164.7)
Shares:
Weighted average ordinary shares outstanding	38.8		38.2		38.6	38.4
Dilutive effect of RSUs, option awards and PSUs	0.8		0.1		1.0
Diluted weighted average ordinary shares outstanding	39.6		38.3		39.6	38.4
Income (loss) per share:
Net income (loss) per share- basic, continuing	$ 3.43		$ 0.68		$ 5.15	$ (1.14)
Net income (loss) per share- basic, discontinued operations	0.48		(4.04)		0.62	(3.15)
Net income (loss) per share- basic	3.91		(3.36)		5.77	(4.29)
Net income (loss) per share- diluted, continuing	3.35		0.67		5.02	(1.14)
Net income (loss) per share- diluted, discontinued operations	0.47		(4.02)		0.61	(3.15)
Net income (loss) per share- diluted	$ 3.82		$ (3.35)		$ 5.63	$ (4.29)
Anti-dilutive shares excluded	0.6		1.9		0.6