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Restructuring Liabilities (Details) - USD ($) $ in Millions	12 Months Ended
Restructuring Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018
Restructuring Reserve [Roll Forward]
Restructuring liability at beginning of year	$ 25.6	$ 31.6	$ 30.9
Restructuring charges	40.2	34.4	41.0
UTS liabilities at acquisition date	8.3
Cash paid	(40.6)	(37.8)	(43.1)
Foreign currency translation adjustments	(1.2)	(2.6)	2.8
Restructuring liability at end of year	32.3	25.6	31.6
Current portion				$ 23.6	$ 18.0
Noncurrent portion				8.7	7.6
Total	32.3	31.6	31.6	32.3	25.6
Employee severance and termination
Restructuring Reserve [Roll Forward]
Restructuring liability at beginning of year	7.6	6.2	4.0
Restructuring charges	30.9	25.6	34.7
UTS liabilities at acquisition date	8.3
Cash paid	(27.6)	(24.3)	(33.1)
Foreign currency translation adjustments	(0.2)	0.1	0.6
Restructuring liability at end of year	19.0	7.6	6.2
Current portion				13.1	7.6
Noncurrent portion				5.9	0.0
Total	7.6	6.2	6.2	19.0	7.6
Employee severance and termination \| C&W
Restructuring Reserve [Roll Forward]
Restructuring charges		9.0
Contract termination and other
Restructuring Reserve [Roll Forward]
Restructuring liability at beginning of year	18.0	25.4	26.9
Restructuring charges	9.3	8.8	6.3
UTS liabilities at acquisition date	0.0
Cash paid	(13.0)	(13.5)	(10.0)
Foreign currency translation adjustments	(1.0)	(2.7)	2.2
Restructuring liability at end of year	13.3	18.0	25.4
Current portion				10.5	10.4
Noncurrent portion				2.8	7.6
Total	13.3	25.4	26.9	$ 13.3	$ 18.0
Contract termination \| VTR
Restructuring Reserve [Roll Forward]
Restructuring charges		6.0	6.0
Employee severance and termination \| C&W
Restructuring Reserve [Roll Forward]
Restructuring charges	$ 5.0	$ 15.0	23.0
Employee severance and termination \| VTR
Restructuring Reserve [Roll Forward]
Restructuring charges			$ 10.0