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Debt and Other Financing (Debt) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Sep. 30, 2019	Jul. 31, 2019	Dec. 31, 2018	Aug. 31, 2016	Mar. 31, 2014	Mar. 31, 2013
Debt Instrument [Line Items]
Short term debt	$ 1.8			$ 8.8
Current portion of long-term debt	0.0			3.2
Total	1.8			12.0
Present value of lease liabilities	2.4			0.0
Total	1,590.4			1,584.8
Less current portion	0.0			(3.2)
Long-term debt	1,590.4			1,581.6
4.60% Notes, due March 2020
Debt Instrument [Line Items]
Notes	0.0			386.4
Interest rate, stated percentage						4.60%	4.60%
6.50% Senior Secured Notes, due August 2022
Debt Instrument [Line Items]
Total	392.6			0.0
Interest rate, stated percentage						6.50%
7.875% Senior Secured Notes, due August 2022
Debt Instrument [Line Items]
Total	495.8			494.2
Interest rate, stated percentage					7.875%
5.00% Notes, due March 2023
Debt Instrument [Line Items]
Notes	459.3			458.5
Interest rate, stated percentage			5.00%			5.00%	5.00%
Other debt, payable through 2025
Debt Instrument [Line Items]
Other debt, payable through 2025	0.0			4.6
6.95% Notes, due March 2043
Debt Instrument [Line Items]
Notes	$ 241.3			$ 241.1
Interest rate, stated percentage		6.95%				6.95%	6.95%