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Borrowings Convertible Debt (Details) - Convertible Debt - Convertible Notes Due Twenty Twenty One $ / shares in Units, $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2018 USD ($) $ / shares	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2018 USD ($) $ / shares	Jun. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)	May 04, 2016 USD ($) $ / shares
Schedule of Convertible Debt
Debt Instrument, Interest Rate, Stated Percentage							3.25%
Debt Instrument, Convertible, Conversion Ratio				54.2741
Debt Instrument, Convertible, Conversion Price | $ / shares	$ 18.4250			$ 18.4250
Debt Issuance Costs, Net	$ 5.0			$ 5.0
Debt Issuance Costs Attributable to the Equity Component				1.3
Deferred Tax Assets, Net	0.5			0.5
Debt Instrument, Face Amount	172.5			172.5		$ 172.5	$ 172.5
Debt Instrument, Unamortized Discount	27.1			27.1		30.6
Convertible Notes Payable	145.4			145.4		141.9
Convertible Notes Payable, Current	0.0			0.0		0.0
Convertible Notes Payable, Noncurrent	145.4			145.4		141.9
Debt Instrument, Convertible, Carrying Amount of Equity Component	29.9			29.9		$ 29.9
Debt Instrument, Fair Value Disclosure	193.7			193.7
Interest Expense, Debt, Excluding Amortization	1.4	$ 1.4		2.8	$ 2.8
Amortization of Debt Issuance Costs	0.2	0.2		0.4	0.4
Amortization of Debt Discount (Premium)	1.6	1.5		3.1	2.9
Interest Expense, Debt	$ 3.2	$ 3.1		$ 6.3	$ 6.1
Payments for Hedge, Financing Activities			$ 44.5
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares							$ 21.1050
Proceeds from issuance of warrants			$ 39.1

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