Financial Instruments and Risk Management Financial Instruments and Risk Management (Rollforward of Contingent Consideration) (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Accretion expense		$ 5.1
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings	[1]	2.9
Business Combination Contingent Consideration Liability Payments		(0.3)
Business Combination, Contingent Consideration Arrangements, Reclassifications		0.0
Contingent consideration		461.4	$ 453.7
Other current liabilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Accretion expense	[2]	0.0
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings	[1],[2]	0.0
Business Combination Contingent Consideration Liability Payments	[2]	(0.3)
Business Combination, Contingent Consideration Arrangements, Reclassifications		32.0
Contingent consideration		199.5	167.8
Other long-term obligations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Accretion expense	[3]	5.1
Fair Value, Measured on Recurring Basis, Gain (Loss) Included in Earnings	[1],[3]	2.9
Business Combination Contingent Consideration Liability Payments	[3]	0.0
Business Combination, Contingent Consideration Arrangements, Reclassifications		(32.0)
Contingent consideration		$ 261.9	$ 285.9

[1] Included in litigation settlements and other contingencies, net in the Condensed Consolidated Statements of Operations.

[2] Included in other current liabilities on the Condensed Consolidated Balance Sheets.

[3] Included in other long-term obligations on the Condensed Consolidated Balance Sheets.