Share-based Incentive Compensation Plans - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period of stock options	10 years
Weighted average volatility rate used	70.00%
Expected volatility of stock price	30.00%
Aggregate intrinsic value	$ 12.0	$ 5.0	$ 0.0
Vested	$ 124.0	$ 99.0	$ 102.0
Restricted Share Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of awards vested during period (in shares)	1,300,000
Number of awards not vested (in shares)	1,900,000	2,400,000
Granted	$ 50.15	$ 50.55	$ 42.30
Restricted Share Units (RSUs) | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		1 year	1 year
Restricted Share Units (RSUs) | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		3 years	3 years
Restricted Share Units (RSUs) | Non-Employee Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of award granted (in shares)	18,571	22,637	27,261
PSU awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of awards vested during period (in shares)	1,200,000
Number of awards not vested (in shares)	2,200,000	2,500,000
Granted	$ 51.64	$ 53.21	$ 42.32
PSU awards | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	1 year
Share-based payment award, vesting percentage	0.00%	0.00%	0.00%
PSU awards | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years
Share-based payment award, vesting percentage	150.00%	150.00%	150.00%
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option holding period	1 year
Expiration period of stock options	10 years
Strike price (usd per share)	$ 50.03			$ 37.60
Aggregate intrinsic value	$ 53.5	$ 6.6
2013 Omnibus Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reserved and available for issuance (in shares)	7,650,000
Shares available for issuance (in shares)	347,663
2014 Omnibus Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reserved and available for issuance (in shares)	17,800,000
Shares available for issuance (in shares)	3,519,189
2019 Omnibus Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reserved and available for issuance (in shares)	11,700,000
Shares available for issuance (in shares)	11,802,649
2013 Non-Employee Director Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reserved and available for issuance (in shares)	288,000