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Long-term Debt (Detail Textuals 1) - USD ($) $ / shares in Units, $ in Millions		1 Months Ended	9 Months Ended	12 Months Ended
	May. 01, 2014	May. 16, 2007	Mar. 31, 2016	Dec. 31, 2014
Cash Flow Hedging | Interest Rate Swap Agreements
Debt Instrument [Line Items]
Swap agreements			$ 600.0
Convertible Notes Payable
Debt Instrument [Line Items]
Convertible senior subordinated notes, issuance date		May 16, 2007
Par value of convertible notes		$ 300.0
Convertible senior subordinated notes, maturity date		May 01, 2014
Convertible Notes - Aggregate Conversion Value	$ 406.8
Settlement of Convertible Notes in cash	$ 300.0
Settlement of Convertible Notes in shares	1,400,000
Convertible Notes Payable | Call Options
Debt Instrument [Line Items]
Call options, cost			$ 84.4
Call options, maximum number of shares that can be purchased			5,500,000
Call options, strike price			$ 54.65
Number of shares received upon exercise of options	1,400,000
Convertible Notes Payable | Warrants
Debt Instrument [Line Items]
Warrants, maximum number of shares that can be issued			5,500,000
Warrants, strike price			$ 68.31
Warrants, proceeds from sale			$ 56.5
Warrants, number of shares issued upon settlement				497,550

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