Consolidated Statements of Cash Flows (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Cash Flows [Abstract]
Discontinued operations cash	$ 0.0	$ 677.5	$ 324.4	$ 258.8

Amount classified as cash and cash equivalents attributable to disposal group held for sale or disposed of.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant