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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Gross number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Stock-Based Compensation Plans, Stock-Based Award Plan Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	May 31, 2017
Share-based Compensation Arrangement [Abstract]
Stock-based compensation expense	$ 2.8
Risk-free interest rate	2.00%
Expected dividend rate	0.00%
Accrued liabilities	$ 248.5	$ 271.2
Other Operating Expense, Net [Member]
Share-based Compensation Arrangement [Abstract]
Stock-based compensation expense		$ 77.6
Minimum [Member]
Share-based Compensation Arrangement [Abstract]
Expected life of options	1 year
Assumed volatility	26.80%
Maximum [Member]
Share-based Compensation Arrangement [Abstract]
Expected life of options	1 year 3 months 18 days
Assumed volatility	27.30%
Stock Options and Stock Appreciation Rights [Member]
Share-based Compensation Arrangement [Abstract]
Expected life of options			5 years 1 month 6 days
Risk-free interest rate			1.30%
Assumed volatility			49.50%
Expected dividend rate	0.00%	0.00%	0.00%
Shares [Roll Forward]
Outstanding, beginning balance (in shares)	12,834	13,285	17,033
Granted (in shares)	866	799	2,427
Settled (in shares)	(905)	(193)	(1,980)
Forfeited (in shares)	(443)	(1,057)	(2,931)
Converted to liability (in shares)			(1,264)
Outstanding, ending balance (in shares)	12,352	12,834	13,285
Vested (in shares)	11,095
Outstanding Weighted-Average Exercise Price [Abstract]
Outstanding, beginning balance (in dollars per share)	$ 9.54	$ 8.85	$ 8.36
Granted (in dollars per share)	31.64	20.00	10.75
Settled (in dollars per share)	8.40	8.17	8.18
Forfeited (in dollars per share)	16.22	8.34	8.31
Converted to liability (in dollars per share)			8.16
Outstanding, ending balance (in dollars per share)	10.93	$ 9.54	$ 8.85
Vested (in dollars per share)	$ 9.18
Share-based Payment Award, Options, Additional Disclosures [Abstract]
Outstanding, weighted average remaining contractual term	6 years 1 month 6 days
Vested, weighted average remaining contractual term	5 years 9 months 18 days
Outstanding, aggregate intrinsic value of in-the-money options	$ 126.2
Vested, aggregate intrinsic value of in-the-money options	$ 124.3
Stock Options and Stock Appreciation Rights [Member] \| Minimum [Member]
Share-based Compensation Arrangement [Abstract]
Expected life of options	7 years	5 years
Risk-free interest rate	2.90%	1.90%
Assumed volatility	31.10%	41.20%
Stock Options and Stock Appreciation Rights [Member] \| Maximum [Member]
Share-based Compensation Arrangement [Abstract]
Expected life of options	7 years 6 months	6 years 3 months 18 days
Risk-free interest rate	3.10%	2.10%
Assumed volatility	35.40%	45.80%
2017 Omnibus Incentive Plan [Member]
Share-based Compensation Arrangement [Abstract]
Expiration period	10 years
2017 Omnibus Incentive Plan [Member] \| Minimum [Member]
Share-based Compensation Arrangement [Abstract]
Vesting period	4 years
2017 Omnibus Incentive Plan [Member] \| Maximum [Member]
Share-based Compensation Arrangement [Abstract]
Number of shares available for grant and reserved for issuance (in shares)				8,600
Vesting period	5 years
2013 and 2017 Plan [Member] \| Former Employee [Member]
Share-based Compensation Arrangement [Abstract]
Stock-based compensation expense	$ 3.8
2013 and 2017 Plan [Member] \| Equity Awards [Member]
Share-based Compensation Arrangement [Abstract]
Stock-based compensation expense	7.2
2013 and 2017 Plan [Member] \| Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement [Abstract]
Reduction in liability	$ 8.2
2013 Stock Incentive Plan [Member]
Share-based Compensation Arrangement [Abstract]
Number of shares available for grant and reserved for issuance (in shares)	20,900
2013 Stock Incentive Plan [Member] \| Equity Awards [Member]
Share-based Compensation Arrangement [Abstract]
Stock-based compensation expense	$ 0.0
2013 Stock Incentive Plan [Member] \| Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement [Abstract]
Accrued liabilities	7.9	$ 16.8
2013 Stock Incentive Plan [Member] \| Stock Options [Member]
Share-based Compensation Arrangement [Abstract]
Stock-based compensation expense		77.6
Unrecognized compensation cost	20.3	9.1
2013 Stock Incentive Plan [Member] \| Restricted Stock Awards [Member]
Share-based Compensation Arrangement [Abstract]
Unrecognized compensation cost	$ 20.3	$ 9.1
2013 Stock Incentive Plan [Member] \| 3 Years Vesting [Member]
Share-based Compensation Arrangement [Abstract]
Percentage of awards vesting	50.00%
2013 Stock Incentive Plan [Member] \| 4 Years Vesting [Member]
Share-based Compensation Arrangement [Abstract]
Percentage of awards vesting	50.00%
2013 Stock Incentive Plan [Member] \| 5 Years Vesting [Member]
Share-based Compensation Arrangement [Abstract]
Percentage of awards vesting	50.00%