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Fair value measurements - Measured on a Recurring Basis (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Liabilities:
Share-based compensation		$ 4.9	$ 0.8
Fair Value, Measurements, Recurring
Assets:
Equity investments	$ 2.2	2.2
Liabilities:
Deferred compensation arrangement	1.5	1.5		$ 0.7
Separation-related Reimbursement Awards	0.9	0.9		2.1
Total liabilities	2.4	2.4		2.8
Share-based compensation	0.1	0.3
Fair Value, Measurements, Recurring | Level 1
Assets:
Equity investments	2.2	2.2
Liabilities:
Deferred compensation arrangement	1.5	1.5		0.7
Separation-related Reimbursement Awards	0.9	0.9		2.1
Total liabilities	$ 2.4	$ 2.4		$ 2.8

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Fair value of obligations measured on a recurring basis.

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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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