Stock-Based Compensation Plans - (PRSUs settlement) (Details)	12 Months Ended
	Dec. 31, 2019 $ / shares shares
Equity-settled PRSUs
PRSUs
Balance outstanding at beginning of period (in units) | shares	2,000,384
Grants (in units) | shares	781,026
Performance adjustment (in units) | shares	762,326
Forfeitures (in units) | shares	(53,070)
Balance options outstanding at end of period (in units) | shares	3,490,666
Weighted Average Grant-Date Fair Value
Balance outstanding at beginning of period (in dollars per unit) | $ / shares	$ 9.53
Grants (in dollars per unit) | $ / shares	21.08
Performance adjustment (in dollars per unit) | $ / shares	21.08
Forfeitures (in dollars per unit) | $ / shares	13.48
Balance outstanding at end of period (in dollars per unit) | $ / shares	$ 14.59
Cash-settled PRSUs
PRSUs
Balance outstanding at beginning of period (in units) | shares	522
Vests (in units) | shares	(507)
Balance options outstanding at end of period (in units) | shares	15
Weighted Average Grant-Date Fair Value
Balance outstanding at beginning of period (in dollars per unit) | $ / shares	$ 34,221
Vests (in dollars per unit) | $ / shares	33,842
Balance outstanding at end of period (in dollars per unit) | $ / shares	$ 94,997