Held for Sale and Discontinued Operations (Cash Flows Table) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net cash provided from discontinued operations (Note 19)	$ 0.0	$ 157.0	$ 23.6
Net cash provided from investing activities — discontinued operations (Note 19)	0.0	3.0	241.4
Net cash used for financing activities — discontinued operations (Note 19)	0.0	(61.9)	(93.8)
Net change in cash during the period		98.1	171.2
Cash balance at beginning of year	97.1	80.2	77.8
Net change in cash during the period - continuing operations	13.2	16.0	2.1
Cash balance at end of year	110.3	97.1	80.2
Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash balance at beginning of year	$ 0.0	70.5	245.4
Net change in cash during the period - continuing operations		(0.9)	(0.3)
Cash sold as part of sale of consolidated subsidiaries		(167.7)	(345.8)
Cash balance at end of year		$ 0.0	$ 70.5