Discontinued Operations and Assets Held for Sale Assets and Liabilities Included in Held for Sale (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Assets held for sale:
Cash and cash equivalents	$ 0.0	$ 10.1	$ 0.0
Assets held for sale	0.0	160.0
Liabilities associated with assets held for sale:
Liabilities associated with assets held for sale	$ 0.0	105.9
California Discontinued Entities | Discontinued Operations, Held-for-sale
Assets held for sale:
Cash and cash equivalents		10.1
Accounts receivable		7.9
Inventory		1.9
Other current assets		1.3
Property, plant & equipment, net		130.0
Other intangibles, net		6.6
Other non-current assets		2.2
Assets held for sale		160.0
Liabilities associated with assets held for sale:
Accrued expenses and other current liabilities		9.5
Deferred tax liabilities		63.9
Other non-current liabilities		32.5
Liabilities associated with assets held for sale		$ 105.9